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A D V A N C E   P R O G R A M M E    |   P R O G R A M M E   P R E L I M I N A I R E

Nice Acropolis, Nice, France

10-15 September 2000

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 . CLEO/Europe-IQEC 2000
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CLEO/Europe-IQEC Technical Program - WEDNESDAY POSTERS

12 - 14 September, Nice Acropolis, Nice, France

 

MONDAY

TUESDAY

WEDNESDAY

THURSDAY

FRIDAY

TUESDAY POSTERS WEDNESDAY POSTERS THURSDAY POSTERS

 

CLEO POSTERS
 
CLEO/Europe Poster Session
Room: Rhodes
14:30 - 16:00
 
 
CWF1 14:30 - 16:00
Lanthanide Coordination Compounds with Organic Ligands as Prospective Electroluminescent Materials, Roman Ivanov, N.P. Kuzmina, Moscow State University, Moscow, RUSSIA, A.A. Egorov, Lumex Company, Moscow, RUSSIA
A series of novel efficient luminescent mixed ligand complexes on base of terbium phenylantranilate and europium b-diketonates were synthesized. The luminescence spectra compounds obtained and time dependence luminescent stability were investigated.
 
 
CWF2 14:30 - 16:00
Calculation and Fabrication of 2D Photonic Bandgap Structures in Polymer Slab Waveguides, Christian Liguda, R. Blum, G. Boettger, A. Kuligk, Manfred Eich, Technische Universitaet Hamburg-Harburg, Hamburg, GERMANY, W. Morgenroth, H. Roth, H. Elsner, H.G. Meyer, Inst f. Physikalische Hochtechnologie e.V., Jena, GERMANY
Three dimensional finite difference time domain simulation and fabrication of 2D photonic bandgap structures in waveguides from low loss dielectrics.
 
CWF3 14:30 - 16:00
Chemically Assisted Nitrogen Ion Beam Etching in Polymeric Optical Waveguide, Kozo Taguchi, Tomohiko Ueguchi, Masahiro Ikeda, Fukuyama University, Hiroshima, JAPAN
The influence of process parameter such as gas composition, kinetic energy of the ion and sample temperatures was investigated in detail in order to discuss the chemically assisted Nitrogen ion beam etching mechanism of polymer.
 
 
CWF4 14:30 - 16:00
Holographic Recording and Reconstruction of the Angular Momentum of Light in Doped Polymers, R. Birabassov, Tigran Galstyan, Universite Laval, Quebec City, QC, CANADA
Conditions for holographic recording and reconstruction of polarization state of light are theoretically considered and experimentally studied. The obtained results show the possibility of complete optical recording of light's state in dye-doped polymer systems.
 
 
CWF5 14:30 - 16:00
An All-Optical Spatial Switch in Bacteriorhodopsin, R.E. de Araujo, Anderson Gomes, Universidade Federal de Pernambuco, Recife, PE, BRAZIL, G. Borissevitch, Ciencias e Letras de Ribeirao Preto, Ribeirao Preto, BRAZIL
An all-optical beam deflection of 1.1 mrad was obtained in bacteriorhodopsin for a cw pump intensity of ~930W/cm2. This is one of the highest non-thermal all optical deflection for a low driving intensity in a biological medium.
 
 
CWF6 14:30 - 16:00
Optical Probe of pKa in Organic Materials Using the Z-Scan Technique, R.E. de Araujo, Anderson Gomes, Cid de Araujo, Universidade Federal de Pernambuco, Recife, BRAZIL
We demonstrate the use of the Z-scan technique as a method to measure a chemical equilibrum parameter, the pKa value, in acid-base reactions. The measurements were performed with picosecond pulses in Methyl Orange aqueous solution.
 
 
CWF7 14:30 - 16:00
THz Wave Hollow Waveguide with Ferroelectric PVDF Polymer as the Cladding Material, T. Hidaka, S. Maeta, Y. Kanai, Shonan Institute of Technology, Fujisawa, JAPAN, Kazuhiro Komori, H. Nakagawa, Electrotechnical Laboratory, Tsukuba, JAPAN
A new type of THz wave hollow waveguide is developed. The refractive index of PVDF polymer is expected to be lower than unity at the frequency of several THz region. The transmission of hollow light pipe with 5mm bore and 30cm long made with PVDF was several times better than a metal hollow light pipe with the same structure.
 
 
CWF8 14:30 - 16:00
Dynamic Photorefraction in a Novel Type of Polymer Nanocomposite, I.V. Yurasova, Russian Academy of Sciences, Nizhny Novgorod, RUSSIA, A.S. Kuzhelev, Russian Academy of Sciences, Nizhny Novgorod, RUSSIA, Oleg Antipov, W.E. Douglas, Universite Montpellier II, Montpellier, FRANCE, L.G. Klapshina, V.V. Semenov, G.A. Domrachev, T.I. Lopatina, Russian Academy of Sciences, Nizhny Novgorod, RUSSIA
Novel photorefractive nanocomposites composed of poly(vinylcarbazole), poly(aryleneethynylenesilylene) and fullerence have been prepared and studied by visible and near-IR laser beams. Two-wave and four-wave mixing as well as the z-scan technique were used to investigate the origin of the nonlinearity and the temporal behaviour.
 
 
CWF9 14:30 - 16:00
Photo-Induced Birefringence in a Liquid Crystalline Azobenzene Side-Chain Polymer without the Trans-Cis Photoisomerization, Won-Jae Joo, H. Sin, C. Oh, S. Song, Pill Soo Kim, B. Ko, Y.K. Han, Hanyang University, Seoul, KOREA
Photo-induced birefringence in side-chain azobenzene polymer has been investigated. We have found that the birefringence can be induced by a linearly polarized pumping light at the wavelength of the cis-absorption band.
 
CWF10 14:30 - 16:00
Electric Field Control of Permanent Gratings in Dye-Doped Liquid Crystals, Malgosia Kaczmarek, Svetlanae Tatarkova, Changxi Yang, Roy Sambles, University of Exeter, Exeter, UK
We report on permanent grating, one and two-dimensional, that can be created in dye-doped liquid crystal cell with no polymer coating of the cell surfaces. The diffraction efficiency of the grating can be controlled by applied AC field.
 
 
CWF11 14:30 - 16:00
Fast Third-Order Non-Linear Optical Response of Novel Conjugated Silicon-Ethynylene Polymers and mettallocomplexes, Oleg Antipov, Russian Academy of Sciences, Nizhny Novgorod, RUSSIA, B. Bushuk, G.A. Domrachev, Russian Academy of Sciences, Nizhny Novgorod, RUSSIA, W.E. Douglas, Universite Montpellier II, Montpellier, FRANCE, L.G. Klapshina, A.S. Kuzhelev, Russian Academy of Sciences, Nizhny Novgorod, RUSSIA, A.P. Zinov'ev, Russian Academy of Sciences, Nizhny Novgorod, RUSSIA
The fast x(3) optical nonlinearities of a series of new poly(aryleneethylenesilylene)s and metallocomplexes have been studied by picosecond z-scan and four-wave mixing both in solution and in polymeric matrices. The nonlinear coefficient was varied by the introduction of organic groups and metals into the polymers.
 
 
CWF12 14:30 - 16:00
Effects of pH and Ionic Strength on the Structure and Spectroscopic Properties of Fe(III) Complex Porphyrin in Aqueous Solutions, Anderson Gomes, Iouri Borissevitch, Universidade Federal de Pernambuco, Recife, BRAZIL, Ednalva Vidoto, Otaciro Nascimento, Universidade de Sao Paulo, Sao Carlos, BRAZIL, A.G. Bezerra, Cid de Araujo, Universidade Federal de Pernambuco, Recife, BRAZIL, Shirley Gandini, Marcel Tabak, Kelson. Oliveira, M. Trsic, Universidade de Sao Paulo, Sao Carlos, BRAZIL
The effects of pH and ionic strength on the equlibrium of different forms of Fe(III) porphyrin were studied by linear optical absorption, Z-scan technique and electroparamagnetic resonance. The results compared well with quantum chemical calculations.
 
 
CWF13 14:30 - 16:00
Optical Nonlinearitites in Silver Nanocluster in Poly (Methyl Methacrylate), Miguel Torres-Cisneros, Naohisa Yanagihara, B. Gonzalez-Rolon, M.A. Meneses-Nava, R. Jaime-Rivas, O.G. Ibarra-Manzano, J.A. Andrade-Lucio, Monica Trejo, Universidad de Guanajuato, Salamanca, GTO, MEXICO
Silver in PMMA films were prepared by bulk polymerization of methyl metacrylate solution of silver trifluoracetate and followed by post-heating. Third-optical susceptibilities were measured.
 
 
CWF14 14:30 - 16:00
Characterization of Metal/Self-Assembled Organic Monolayers by Picosecond SFG Spectrometer, Zenonas Kuprionis, A. Rinkevicius, L. Jacinavicius, EKSPLA Ltd., Vilnius, LITHUANIA, G. Tourillon, Lab de Cristallographie, Grenoble, FRANCE
Picosecond table-top sum frequency generation spectrometer with a wide tunability range was developed. Mode-locked neodymium laser and mid-infrared parametric generator were used for the sum frequency generation. Functional of spectrometer has been checked on model monolayers systems.
 
 
CWF15 14:30 - 16:00
Nonlinear Spectroscopy of Organic Molecules Optimized for Optical Power Limiting, Yannick Morel, Y. Kervella, O. Stephan, Patrice Baldeck, Universite Joseph Fourier, St Martin d'Heres, FRANCE
We report on nonlinear spectroscopy measurements to design organic molecules optimized for both two-photon absorption and excited-state absorption for applications to optical power limiting in the visible.
 
 
CWF16 14:30 - 16:00
Optical Materials for Output Windows of Large-Scale E-Beam-Pumped KrF Lasers, Vladimir Zvorykin, S.V. Arlantsev, V.G. Bakaev, N.V. Morozov, O.V. Rantsev, S.I. Sagitov, P.B. Sergeev, G.V. Sychugov, A. Yu. Tserkovnikov, Russian Academy of Sciences, Moscow, RUSSIA
Fused silica, calcium fluoride, magnesium flouride, and synthetic leucosapphire to be used as output windows or coating materials for large-scale e-beam-pumped KrF laser were investigated in regard of their stability to simultaneous action of UV laser radiation, bremsstrahlung X-rays, scattered energetic electrons and fluorine etching.
 
CWF17 14:30 - 16:00
Tuning Room Temperature Noncritical Phase Matching of LiNbO3 in the Crystal Growth Process, J. Capmany, Universidad Miguel Hernandez, Elche, SPAIN, M.D. Serrano, Ernesto Dieguez, Universidad Autonoma de Madrid, Madrid, SPAIN
A varible concentration (0-9 wt. %) of K2O added to the congruent melt in the czohralski growth process of LiNbO3 crystals permits accurate tuning of the fundamental wavelength between 970 and 1067nm in Type I noncritical second harmonic generation at room temperature.
 
 
CWF18 14:30 - 16:00
Nonlinear Optical Properties of
Zn1-xAgxSe Mixed Crystals, Beata Derkowska, Laboratoire POMA, Angers, FRANCE, Bouchta Sahraoui, Universite d'Angers, Angers, FRANCE, I. V. Kityk, Institute of Physics, Czestochowa, POLAND, J. Berdowski, Institute of Physics, Czestochowa, POLAND
Theoretical mechanic quantum calculations and experimental studies of the influence of doping effects on linear absorption, nonlinear absorption and nonlinear optical susceptibilities in
Zn1-xAgxSe mixed crystals using picosecond laser pulses at 532 nm, are reported.
 
 
CWF19 14:30 - 16:00
Optical Investigation of Eu3+ and Tm3+ in the Ca4GdO(BO3)3 (GdCOB) Crystal, G. Dominiak-Dzik, W. Ryba-Romanowski, S. Golab, A. Pajaczkowska, Polish Academy of Sciences, Wroclaw, POLAND
Nature and number of non-equivalent rare earth sites in the Ca4GdO(BO3)3 crystal has been studied using absorption and emission spectra of Eu3+ and Tm3+ ions. Contribution of radiative transitions in relaxation of excited states has been evaluated.
 
 
CWF20 14:30 - 16:00
Light Channeling and Localization in Defect Modes of Two-Dimensional Photonic Band-Gap Structures, A.V. Tarasishin, S.A. Magnitskii, A.M. Zheltikov, M.V. Lomonosov Moscow State University, Moscow, RUSSIA
Finite-difference time-domain analysis of light propagation in a defect mode of a two-dimensional photonic band-gap structure demonstrates light field localization within areas with subwavelength (l/10) sizes and reveal efficient evanescent wave formation at the output of such a PBG structure.
 
 
CWF21 14:30 - 16:00
Band Structure of Guided and Leaky Modes in Two-Dimensional Photonic Crystals of a Slab Type, Tetsuyuki Ochiai, Kazuaki Sakoda, Hokkaido University, Sapporo, JAPAN
We study band structure of leaky modes and guided modes in two-dimensional photonic crystals of a slab type by the finite difference time domain method and by a group-theoretical argument.
 
CWF22 14:30 - 16:00
New Method of Fabrication of Resonant Photonic Band Gap Structures Based on the Polymer Films Containing Multivalent Rare-Earth Metal Cations Formed by Stepwise Alternate Adsorption of Metal Cations and Polyanions, I. Beresneva, G. Khomutov, B.I. Mantsyzov, I.A. Ozheredov, A.P. Shkurinov, M.V. Lomonosov Moscow State University, Moscow, RUSSIA, Pascal Masselin, G. Mouret, Universite du Littoral, Dunkerque, FRANCE
We present a new method of fabrication of PBG materials that may have periodic modulation of refraction index, absorption coefficient and the nonlinearity as well based on the layer-by -layer self-assembly technique.
 
 
CWF23 14:30 - 16:00
Metal-Oxide-Semiconductor Light-Emitting Diodes at Si Bandgap Energy, Miin-Jang Chen, Ching-Fuh Lin, Jiann Jong Chiu, Cheewee Liu, Shu-Wei Chang, National Taiwan University, Taipei, TAIWAN, R.O.C.
Metal-oxide-semiconductor structures on Si could behave like light-emitting diode if the oxide is extremely thin. The emission is at wavelengths corresponding to Si bandgap and above 1.3 µm. Emission characteristics and physics are studied.
 
 
CWF24 14:30 - 16:00
Energy Transfer Characteristics in Yb3+-Ion-Doped Laser Materials, Yoh Mita, M. Togashi, H. Yamamoto, Tokyo Engineering University, Tokyo, JAPAN
Energy transfer processes have been examined in Yb3+-doped Y3AI5O12 and related oxides for optimizing laser materials systematically. It has been shown that the energy transfer coefficeint from Yb3+ to Tm3+ ions is considerably larger in oxides than in fluoride crystals.
 
 
CWF25 14:30 - 16:00
Comparative Spectroscopy of As-Grown and g-Irradiated YAG and Nd;YAG Influence of Ce3+- and Cr3+-Codoping, B.-M. Dicks, P. Jander, Klaus Petermann, Guenter Huber, Universitaet Hamburg, Hamburg, GERMANY
Different samples of -Ce3+-and Cr3+- codoped YAG and Nd:YAG were investigated in short wavelength and 1064nm absorption measurements at room temperature. Temperature dependent UV/VIS fluorescence as well as low-temperature excitation experiments were performed.
 
 
 
CWF26 14:30 - 16:00
Progress in the Growth of Colquitite Type Laser Host Crystals, Detlef Klimm, R. Uecker, D. Ganschow, P. Reiche, Institute of Crystal Growth, Berlin, GERMANY
LiCAF anf LiSAF are the main Colquiriite type laser host crystal. Homogeneous Cr3+ doping can easily be obtained, as keff _~1.0. The appilcation of proper growth conditions allows the fabrication of single crystal with high perfection.
 
 
CWF27 14:30 - 16:00
Observation of New Excitation Channel of Cerium Ion Through LiCAF Host Crystal, Masahiro Sakai, Toshimasa Kozeki, Hideyuki Ohtake, Nobuhiko Sarukura, Institute for Molecular Science, Okazaki, JAPAN, Zhenlin Liu, Kiyoshi Shimamura, Kenji Nakano, Na Mujilatu, Tsuguo Fukuda, Tohoku University, Sendai, JAPAN
The new excitation channel around 112nm was discovered for Ce:LiCAF crystals. This excitation is originated not from absorption of Ce ions but from absorption around the bandgap of the host crystal.
 
 
CWF28 14:30 - 16:00
Optical and Luminesence Properties of YAlO3-Tm3+ Crystals, D. Sugak, Institute of Materials, Lviv, UKRAINE, Andrii Matkovskii, State University Lvivska Politechnika, Lviv, UKRAINE, A. Durygin, Polish Academy of Sciences, Warsaw, POLAND, Ya. Zhydachevskii, State University Lvivska Politechnika, Lviv, UKRAINE, A. Suchocki, Polish
Academy of Sciences, Warsaw, POLAND, P. Potera, Institute of Physics, Rzeszow, POLAND, Krzysztof Kopczynski, Zygmunt Mierczyk, Military University of Technology, Warsaw, POLAND, M. Vakiv, Institute of Materials, Lviv, Ukraine, F. Wallrafen, Bonn University, Bonn, GERMANY
Results on absorption, photoluminescence and thermoluminescence investigations of YAP-Tm crystals as well as some laser properties of the cyrstals are presented. Nature of fluorescence of defect centers is discussed.
 
CWF29 14:30 - 16:00
Growth of Optical Absorption of GGG:Mg2+Cr4+ Epitaxial Films, Igor Syvorotka, Sergii Ubizskii, Institute of Materials, Lviv, UKRAINE, Sergeii Melnyk, Andrii Matkovskii, State University Lvivska Politechnika, Lviv, UKRAINE, Krzysztof Kopczynski, Zygmunt Mierczyk, Military University of Technology, Warsaw, POLAND
The work represents results and discussion on growth and optical absorption study of epiaxial layers of pure gadolinium gallium garnet (GGG) and doped one by Cr3+ and co-doped with Mg2+ and Cr4+.
 
 
CWF30 14:30 - 16:00
Spectroscopic and Kinetic Investigations of Erbium in Er,Ce:CaGd4Si3O13 (Er,Ce:CGS) Crystals, I.V. Voroshilov, Valery Lebedev, B.V. Ignatiev, V.A. Isaev, A.N. Gavrilenko, V.F. Pisarenko, Kuban State University, Krasnodar, RUSSIA
Spectroscopic and kinetics characteristics of erbium in Er,Ce:CaGd4Si3O13 (Er,Ce:CGS) were obtained. Er,Ce:CGS crystals show promise as materials for lasers engineering with the 1.55µm generation wavelength.
 
 
CWF31 14:30 - 16:00
Asymmetry in I-V Characteristic and Responsivity of GaAs/AlGaAs Quantum Well Infrared Photodetector, Na Li, Yuen Chuen Chan, Yee-Loy Lam, Nanyang Technological University, SINGAPORE, Ning Li, Chinese Academy of Science, Shanghai, CHINA, L. Fu, Australian National University, Canberra, ACT, AUSTRALIA, Wei Lu, S.C. Shen, Chinese Academy of Science, Shanghai, CHINA, H. Tan, C. Jagadish, Australian National University, Canberra, ACT, AUSTRALIA
The asymmetry in the forward and reverse-biased current-voltage characteristic and responsivity of GaAs/AlGaAs quantum well infrared photodetectors grown by MBE and MOCVD has been studied, and the MOCVD samples are found to display more symmetrical performance.
 
 
CWF32 14:30 - 16:00
Analysis of Photodarkening Kinetics in the Pulsed Laser Deposited As2S3 Films, A. Zakery, Andrei Rode, Barry Luther-Davies, Australian National University, Canberra, ACT, AUSTRALIA
Chalcogenide As2S3 glass films of up to 5µm thick were deposited by high-repetition-rate laser ablation. The threshold intensities for laser-induced photodarkening at 515nm were determined for erasable and for permanent darkening of the films.
 
 
CWF33 14:30 - 16:00
LiNbO3 Epitaxial Films on C-Sapphire Substrates for Waveguide Applications, K. Matsubara, S. Niki, Masanobu Watanabe, P. Fons, K. Iwata, A. Yamada, Electrotechnical Laboratory, Ibaraki, JAPAN
High qulaity LiNbO3 films have been epitaxially grown on c-plane a-Al2O3 by means of oxygen radical assisted pulsed laser deposition. Optical confinement on the films has been demonstrated, however, suggesting the surface and interface quality have to be improved. The use of miscut substrates has made possible a significant reduction in structural defects (rotational domains). The correlation between waveguide properties and crystalline quality will be discussed.
 
 
CWF34 14:30 - 16:00
Effect of Inhomogeneous Broadening on the Optical Properties of Quantum Dots, Andrea Owen, Paul Rees, Iestyn Pierce, University of Wales, Bangor, Gwynedd, Wales, UK
We calculate the effect of inhomogeneous broadening on the optical properties of self-assembled quantum dots and highlight the consequences for optoelectronic devices employing these structures.
 
 
CWF35 14:30 - 16:00
Cr4+-Doped Silica-Based Optical Fibres: Absorption and Fluorescence Properties, Bernard Dussardier, V. Felice, G. Monnom, Daniel Ostrowsky, University of Nice-Sophia-Antipolis, Nice, FRANCE
We report for the first time on the Cr4+ broad fluorescence, extending from 1000 to 1600 nm, observed under 860-980 nm laser excitation, in a chromium-doped, aluminium-codoped (1mol%) silica optical fibre.
 
 
CWF36 14:30 - 16:00
Accurate Ordinary Refractive-Index-Profile Characterization of Proton-Exchanged Waveguides, Roberta Ramponi, M. Marangoni, R. Osellame, V. Russo, Politecnico di Milano, Milano, ITALY
An accurate characterization of the ordinary refractive index profile of proton exchanged waveguides is achieved by measuring the power prism-coupled into the waveguide radiation modes as a function of the corresponding effective indices.
 
 
CWF37 14:30 - 16:00
Broadband Infrared Photo-luminescence in Germanate Glass, Mira Naftaly, University of Leeds, Leeds, UK, S. Shen, University of Leeds, Leeds, UK, Animesh Jha, University of Leeds, Leeds, UK
We report a first observation of strong broadband near-infrared photoluminescence in undoped germanate glasses melted at elevated temperatures. The results indicate that broadband tunable lasing is possible in these glasses.
 
 
CWF38 14:30 - 16:00
Thin Film Sol-Gel Fabrication and Characterisation of a New Optically Active Crystalline Phase: Er2Ti2O7, Jochen Fick, LEMO-ENSERG, Genoble, FRANCE, C. Coutier, M. Langlet, LMGP, St Martin d'Heres, FRANCE
Pure Er2Ti2O7 multilayer thin films have been elaborated by the Aerosol-gel technique. Promising results on the spectroscopic properties of amorphous and crystallised films of this optically active phase will be presented.
 
 
CWF39 14:30 - 16:00
Material Processing and Safety Aspects of the Femtosecond Laser Technology, H. Haferkamp, Andreas Ostendorf, M. Goede, Jens Bunte, Laser Zentrum Hannover e.V., Hannover, GERMANY
Examples of industrial femtosecond laser applications are the drilling of injection nozzles and the processing of shape memory alloys. But the fast efforts in the scope of the femtosecond laser beam sources have led to serious safety problems.
 
 
CWF40 14:30 - 16:00
Microstructuring of Periodic Patterns with Femtosecond Laser Pulses, F. Korte, T. Bauer, S. Nolte, A. Egbert, C. Fallnich, H. Welling, Laser Zentrum Hannover e.V., Hannover, GERMANY
The generation of periodic patterns in the micron range using femtosecond laser pulses is investigated. Different approaches to produce these structures fast, reproducible, efficiently and with high precision will be discussed.
 
 
CWF41 14:30 - 16:00
Precise Microstructuring of Metallic Surfaces Improve Wear Properties, Gabriel Dumitru, Valerio Romano, Institute of Applied Physics, Bern, SWITZERLAND, Heinz Weber, University of Bern, Bern, SWITZERLAND, Henry Haefke, Yvonne Gerbig, Centre Suisse d'Electronique, Neuchatel, SWITZERLAND
Precise microstructure were ablated on metallic surfaces using an industrial Q-switched Nd:YAG laser. The tribiological testing of the micropatterned surface produced with optimised processing parameters shows a considerable wear reduction, compared to the unstructured ones.
 
 
CWF42 14:30 - 16:00
High Repetition Rate Microsecond Pulse Generation for Material Processing Using a Planar Waveguide CO2 MOPA System, Qiusheng Cao, H.J. Baker, Denis Hall, Heriot-Watt University, Edinburgh, UK
An 7-pass planar waveguide, carbon dioxide MOPA system is used for pulse amplification in the 1 to 10 µs regime, producing a peak power of 15 kW and 40 mJ energy at 1 kHz rate. The advantages of this regime for material processing will be discussed.
 
 
CWF43 14:30 - 16:00
Machine Concept to Produce Micro Prototypes, Hans Toenshoff, Andreas Ostendorf, Klaus Koerber, Beil, Laser Zentrum Hannover e.V., Hannover, GERMANY
A machine concept is presented for the production of micro prototypes utilising both the stereolithography and the laser sintering process. The concept is going to be realised within a project sponsored by the European Commission.
 
 
CWF44 14:30 - 16:00
Pulsed Laser Ablation Induced Enhancement of TiO2 Photocatalytic Effect, Kosuke Takahashi, Minoru Obara, Keio University, Kohoku-ku, Yokohama, JAPAN
We modified surface structure of bulk TiO2 into highly roughened one by femtosecond Ti:sapphire laser and KrF excimer laser ablation to enhance photocatalytic effect.
 
 
CWF45 14:30 - 16:00
Ultra Super Pulse CO2 Planar Waveguide Laser for Direct Micro-Machining, Francisco Villarreal, Gavin Markillie, UK, P.R. Murray, R.J. Ramirez, H.J. Baker, Denis Hall, Heriot-Watt University, Edinburgh, UK
We report high peak power (3kW), short pulse (10µs) operation of planar waveguide CO2 lasers at repetition rates which preserve the efficiency and average power characteristics of long pulse/cw operation. Materials processing applications of this new laser beam modality will be discussed.
 
 
CWF46 14:30 - 16:00
Laser Polishing of Optical Fiber End Surface, Mircea Udrea, H. Orun, Middle East Technical University, Ankara, TURKEY, A. Alacakir, Ankara Nuclear Research & Training Center, TURKEY
By CO2 laser irradiation of the optical fiber ends the roughness was decreased from 3µm to less than one hundred nanometers and the optical fiber losses were reduced by 1.45 dB.
 
 
CWF47 14:30 - 16:00
Numerical and Experimental Analysis of Pulsed Excimer Laser Processing of SiC, Eric Fogarassy, Christian Dutto, Daniel Mathiot, CNRS Laboratoire PHASE, Strasbourg, FRANCE
Abstract not available.
 
 
CWF48 14:30 - 16:00
KRF Excimer Treatment of Aluminium Nitride, L. Yaghdjian, P. Meja, M. Autric, IRPHE-LP3, Marseilles, FRANCE
KrF laser irradiated AIN shows electrical conductive layers on the surface. A simulation of the temperature profile depending on the roughness changing and experiments in air and vacuum were carried out.
 
 
CWF49 14:30 - 16:00
Formation of a Columnar Topography on Al2O3-TiC Ceramic After KrF Laser Machining, Victor Oliveira, Marco Mendes, Rui Vilar, Instituto Superior Tecnico, Lisboa, PORTUGAL
The formation and growth of columns on Al2O3-TiC ceramic processed with a KrF excimer laser is studied as a function of the number of laser pulses. Columns are characterized by scanning and transmission electron microscopy.
 
 
CWF50 14:30 - 16:00
Sub-Micron Period Grating Structures in Ta2O5 and InOx Thin Oxide Films, Fabricated Using 248nm Interferometric Excimer Laser Ablation, S. Pissadakis, L. Reekie, James Wilkinson, University of Southampton, Southampton, Hampshire, UK, G. Kiriakidis, FO.R.T.H. - I.E.S.L., Heraklion, Crete, GREECE
High quality relief grating of period 500 nm have been patterned in InOx and Ta2O5 thin films using interferometric 248nm excimer laser ablation. Details of the ablation process and the morphology of the gratings are presented.
 
CWF51 14:30 - 16:00
PS-Laser Photolysis of Nitrogen Solid Films at a Cryogenic Temperature, Hiroyuki Niino, Tadatake Sato, Akira Yabe, National Inst of Materials & Chem Research, Ibaraki, JAPAN
The laser photolysis/ablation of nitrogen solid films on Cu plate at 10K was performed upon irradiation with a picosecond laser at 263nm in vacuum. Optical emissions from excited molecular and atomic nitrogen were observed.
 
 
CWF52 14:30 - 16:00
Efficient Curing of Adhesives Using Laser Light, H. Haferkamp, Alexander von Busse, M. Goede, O. Thuerk, J. Stein, Laser Zentrum Hannover e.V., Hannover, GERMANY
Improvement of light-initiated photopolymerisation of acrylate monomers and epoxide resins for curing of adhesives using laser radiation with wavelengths in the UV/VIS and blue region.
 
 
CWF53 14:30 - 16:00
Laser Cutting Supported by Water Jet - Development of a Nozzle Concept for High Momentum Transfer, Thomas
Schuening, R. Rothe, Institut fuer Lasertechnik Ostfriesland, Emden, GERMANY
This novel process introduces a water jet directly behind a laser beam cutting different materials. This restricts escape of gas products behind, while increasing velocity and cooling of, cuts. This method considerably improves material processing.
 
 
CWF54 14:30 - 16:00
Laser Micron Particle Removal from Silicon Surfaces: A Bidimensional Approach, Pedro Neves, Instituto Superior Tecnico, Lisboa, PORTUGAL, M. Arronte, Universidad de la Habana, Havana, CUBA, Rui Vilar, Instituto Superior Tecnico, Lisboa, PORTUGAL
Laser dry cleaning of metallic particles is modelled considering substrate and particle absorption of the radiation. Theoretical and experimental results are compared.
 
CWF55 14:30 - 16:00
Angular Laser Cleaning for the Enhancement of Cleaning Efficiency, Jong-Myoung Lee, C. Curran, Kenneth Watkins, University of Liverpool, Liverpool, UK
Angular laser cleaning is a technique in which the incidence angle of the laser beam to the surface changes, resulting in the enhanced cleaning efficiency for removal of particles on the surface from its unique characteristics.
 
CWF56 14:30 - 16:00
A New Photo-Cleaning Technique for Semiconductor Wafers with Vacuum Ultraviolet Excimer Lamps, Atsushi Yokotani, Yoshinari Maezono, Miyazaki University, Miyazaki, JAPAN, Yousuke Motokawa, Oki Electric Industry Co., Ltd., Miyazaki, JAPAN, Kenji Fujimoto, Kiyomoto Co., Ltd., Miyazaki, JAPAN, Kou Kurosawa, Institute for Molecular Science, Okazaki, JAPAN
A new photo-cleaning technique of organic contamination on silicon wafers using excimer lamps has been developed. A decomposition rate of 20 µg/min*cm2 has been achieved. The contamination has been successfully reduced to the level of partical use.
 
CWF57 14:30 - 16:00
Laser Scanner for Cleaning of Sensitive Surfaces, Karl-Heinz Steglich, Hermann Harde, Universitaet der Bundeswehr Hamburg, Hamburg, GERMANY
Cleaning of polluted and contaminated paint or lacquer layers is investigated using a KrF-excimer laser. We describe the laser scanner, the operating parameters and its applicability for cleaning of radioactively contaminated surfaces.
 
 
CWF58 14:30 - 16:00
Crystalline Carbon Nitride Films Coherently Grown on Si (100) Substrates by Reactive Pulsed Laser Ablation, G. Barucca, Universita di Ancona, Ancona, ITALY, L. Elia, Armando Luches, Universita di Lecce, Lecce, ITALY, G. Majni, Universita di Acona, Ancona, ITALY, M. Martino, Universita di Lecce, Lecce, ITALY, P. Mengucci, Universita di Ancona, Ancona, ITALY, M. Fernandez, Universita di Lecce, Lecce, ITALY
Crystalline CNx films were deposited on Si (100) substrates at room temperature by excimer laser ablation of graphite in N2 atmosphere. The crystallographic structure of the films results a monoclinic one, coherently grown with the Si substrate.
 
 
CWF59 14:30 - 16:00
Pulsed Laser Deposition of Organic and Inorganic Dopant Systems for Chemical Sensors, Filip Vyslouzil, Institute of Chemical Technology, Prague, CZECH REPUBLIC, M. Vrnata, Vladimir Myslik, Miroslav Jelinek, Jan Lancok, Czech Academy of Sciences, Prague, CZECH REPUBLIC
The dopant organic and inorganic systems based on tin acetyl-acetonate (SnAcAc) and tin dioxide (SnO2) were prepared by pulsed laser deposition (PLD). In order to improve their sensitivity (to 1020 ppm of H2) and stability, the influence of dopants (FeAcAc, Fe2O3, NiO) and catalyst (Pt) was investigated. The dopants were prepared PLD as multilayer structures from two targets.
 
 
CWF60 14:30 - 16:00
Selective Preparation of Single-Phase Boron-Rich Silicon Borides Films by Pulsed Nd:YAG Laser Ablation Method, Kaoru Suzuki, Junji Nakata, Nihon University, Chiyoda-ku, Tokyo, JAPAN
Selective preparation of single-phase boron-rich silicon borides (SiBx) films for thermoelectric energy conversion devices were processing by pulsed Nd:YAG laser ablation method. As a result of the laser ablation process under several processing conditions, thin film of SiB4 or SiB6 are selectively presented about three microns thick and about six centimeters square. The influence of process parameters on morphology, phase diagram, electrical conductivity and Seebeck coefficient of the films were also discussed.
 
 
CWF61 14:30 - 16:00
ITO Film Preparation by Infrared Free Electron Laser Assistance, Masato Yasumoto, Akira Ishizu, Kunio Awazu, Takio Tomimasu, Norimasa Umesaki, Osaka National Research Institute, Osaka, JAPAN
Quality of transparent conductive thin film (ITO film) was succeeded to improve on a preparation stage by excitation of stretching vibration mode of the ITO molecule due to infrared free electron laser (IR-FEL) assistant irradiation.
 
 
CWF62 14:30 - 16:00
Optical Forces in Micrometer-Sized Cross-Type Rotator Held by Optical Tweezers, Yoshiro Ohmachi, Tomoyuki Yanagisawa, Masataka Hayakawa, Ashikaga Institute of Technology, Tochigi, JAPAN, Eiji Higurashi, NTT Telecommunications, Kanagawa, JAPAN
We present an analysis on single beam rotational manipulation of a micrometer-sized dielectric rotator. The optical forces are predicted using the ray-optics approximation. Performance characteristics such as trapping position and the corresponding torque as a function of input laser power will be shown.
 
 
CWF63 14:30 - 16:00
Effects of Carrier Capture and Escape on Stability and Periodic Oscillation of Long-Wavelength Quantum-Well Lasers and Phase-Conjugate Feedback, Sergei Voitikov, V.P. Gribkovskii, Oleg Khasanov, T. Smirnova, National Academy of Sciences, Minsk, BELARUS
Carrier transport in long-wavelength quantum-well lasers with phase-conjugate feedback affect the stability/instability of a laser and determine the parameters of both cw and oscillating regimes.
 
 
CWF64 14:30 - 16:00
Auger Recombination Heating and Hot Phonon Effect in Semiconductor Optical Amplifiers, Jean-Noel Fehr, Thierry Hessler, D. Marti, P.E. Selbmann, M.-A. Dupertuis, B. Deveaud, Swiss Federal Institute of Technology, Lausanne, SWITZERLAND
J.-Y. Emery, Beatrice Dagens, OPTO+ Groupment d'Interet Economique, Marcoussis, FRANCE
Spatially resolved measurements of the spontaneous emission from 1.55µm InGaAsP amplifiers yield inhomogeneous carrier temperature profiles and heating up to more than 400K. Such high temperatures are due to Auger recombination and hot phonon effect.
 
 
CWF65 14:30 - 16:00
Quantum Cascade Lasers with Monolithic Photonic Bandgap Mirrors, Lubos Hvozdara, A. Lugstein, Stefan Gianordoli, Norman Finger, Gottfried Strasser, Werner Schrenk, K. Unterrainer, E. Bertagnolli, E. Gornik, Technische Universitaet Wien, Wien, AUSTRIA
GaAs/AlGaAs QCLs are modified by a one-dimensional photonics bandgap mirror, cut into the laser material with a focused ion beam, (FIB) system. Enhancement in the threshold behavior and the operation temperature is achieved.
 
 
CWF66 14:30 - 16:00
Electrical Noise Characterisation of N-Type-Doped Distributed Bragg Mirrors, G. Belleville, P. Signoret, B. Orsal, Universite Montpellier II, Montpellier, FRANCE, M. Wintrebert-Fouquet, Macquarie University, NSW, AUSTRALIA, J. Jacquet, OPTO+ Groupment d'Interet Economique, Marcoussis, FRANCE
Electrical performance of Surface Emitting Lasers is correlated to the electrical characteristic of Distributed Bragg Reflectors. By modeling the electrical noise of one reflecting interface. We can predict the noise of the word device.
 
 
CWF67 14:30 - 16:00
DFB Laser Incorporating Novel Curved-Grating, G.S. Sokolovskii, A.G. Deryagin, V.I. Kuchinskii, A.F. Ioffe Physicotechnical Institute, St. Petersburg, RUSSIA, E.U. Rafailov, D.J.L. Birkin, Wilson Sibbett, University of St. Andrews, St. Andrews, Fife, UK
Theoretical investigation of novel DFB laser with curved-grooves diffraction grating (c-DFB) is presented. Calculations show the proposed design provides spectral selectivity of conventional DFB resonator and output beam focusing in the plane of p-n-junction.
 
 
 
CWF68 14:30 - 16:00
From Spontaneous Emission to Threshold-Crossing: The Case of Distributed Feedback Lasers, Yann Boucher, ENIB/RESO, Brest, FRANCE
We investigate theoretically the gain saturation by Amplified Spontaneous Emission in Distributed Feedback lasers around threshold. Internal sources are described through extended (3x3) transfer matrices. Spectrum, power and possible emissive non-reciprocity are analyzed.
 
CWF69 14:30 - 16:00
Mode-Expander Optimisation for High-Speed Lasers, Kevin Williams, Ian White, University of Bristol, Clifton, Bristol, UK
The design of tapered waveguide mode expanders is addressed systematically in terms of length and taper angle for high data rate lasers for the first time using an active beam propagation model.
 
CWF70 14:30 - 16:00
Optical and Electrical Low-Frequency Noises and Their Correlation in InGaAsP MQW Lasers, John Simmons, S. Smetona, McMaster University, Hamilton, ON, CANADA, J.D. Evans, Nortel Networks, Ottawa, ON, CANADA, J. Matukas, Vilnius University, Vilnius, LITHUANIA, S. Pralgauskaite, Institute of Semiconductor Physics, Vilnius, LITHUANIA, V. Palenskis, Vilnius University, Vilnius, LITHUANIA
A comprehensive study of the optical and electrical low-frequency (1Hz-20kHz) noise characteristics of Fabry-Perot InGaAsP multi-quantum-well lasers has been carried out. Strongly correlated electrical and optical noise peaks with Lorentzian type spectrum were observed at specific currents and/or temperatures.
 
CWF71 14:30 - 16:00
Light Emission From Erbium-Doped Multilayer Porous Silicon Microcavity, Yi Zhou, P. Snow, Philip Russell, University of Bath, Bath, UK
A microcavity with porous silicon multilayer reflectors was electrochemically doped with erbium. Photo-pumping yielded room temperature emission with a peak at 1.536 µm. The spectrum had a full width at half maxium of about 6 nm.
 
 
CWF72 14:30 - 16:00
Influence of Photon Recycling on the Performance of Light Emitting Diodes with Nonuniform Injection, I. Khmyrova, N. Tsutsui, Victor Ryzhii, Tetsuhiko Ikegami, University of Aizu, Fukushima, JAPAN
The photon recycling effect in light emitting diodes with nonuniform injection studied using the developed phenomenological device model. Analytical formulas for the spatial distribution of output radiation intensity and the external quantum efficiency are derived.
 
 
CWF73 14:30 - 16:00
Novel External Resonators for High Power Diode Lasers with Improved Beam Quality, Volker Raab, Ekkehard Ullner, Ralph Menzel, Universitaet Potsdam, Potsdam, GERMANY
Novel concepts of external resonators for broad area lasers improve their brightness by a factor of 10. Output powers of 320mW have been achieved with a beam propagation factor of M2=1.8.
 
 
 
CWF74 14:30 - 16:00
Design of Mode-Locked Integrated Grating Compound Cavity Laser with Tapered Semiconductor Amplifier, Wai Mun Wong, University of Birmingham, Birmingham, UK, H. Ghafouri-Shiraz, Nanyang Technological University, SINGAPORE
We present numerical simulations of a monolithically integrated grating compound cavity laser including a tapered semiconductor amplifier with potential of generating high power multiwavelength picosecond pulses. Design considerations of the integrated device are identified by using an efficient time-domain model.
 
CWF75 14:30 - 16:00
Near-Transform-Limited Picosecond Pulses from Diode Laser with an Aperiodic Bragg-Grating Fibre, D.J.L. Birkin, E.U. Rafailov, Wilson Sibbett, University of St. Andrews, St. Andrews, Fife, UK, L. Zhang, Yu Liu, I. Bennion, Aston University, Birmingham, UK
Generation of near-transform-limited picosecond pulses from a gain-switched diode laser using a chirped Bragg-grating fibre. Utilising the two extreme grating periods the centre wavelength of the output pulses could be shifted by 10 nm.
 
 
CWF76 14:30 - 16:00
Dramatic Spectral Narrowing in a Gain-Switched Diode Laser in a Weak Nonresistant External Cavity, D.J.L. Birkin, E.U. Rafailov, Wilson Sibbett, University of St. Andrews, St. Andrews, Fife, UK, E.A. Avrutin, University of York, Heslington, York, UK
We demonstrated generation of picosecond pulses with a narrow spectral bandwidth from a gain-switched diode laser using a simple compact external cavity scheme formed by an uncoated glass slide.
 
CWF77 14:30 - 16:00
Optical Phase Conjugation Using Four-Wave Mixing in Multisection Laser Diodes, Y. Hong, K. Alan Shore, University of Wales, Bangor, Wales, UK, N. Brooks, J. Sarma, University of Bath, Bath, UK
The conjugate reflectivity in a two-section single cavity Fabry-Perot laser diode is found to be dependent on the facet into which optical injection occurs, injection power and bias current condition.
 
 
CWF78 14:30 - 16:00
Multi-Mode Self-Pulsation in Laser Diodes with Epitaxially Integrated Saturable Absorber, Iestyn Pierce, Paul Rees, Dewi Jones, University of Wales, Bangor, Wales, UK, Huw Summers, Cardiff University, Cardiff, Wales, UK
Measurements of multi-mode self-pulsation are seen to agree closely with a theoretical model. When compared with theory we show the spontaneous emission is an excellent measure of the carrier density in the device.
 
 
CWF79 14:30 - 16:00
Investigation of Multi-Longitudinal Mode Instabilities in Semiconductor Lasers Using a Couple Mode Model with Gain Dispersion, Kenton White, Nortel Networks, Ottawa, ON, CANADA
A coupled mode model with gain dispersion is presented. This model accurately describes multi-longitudinal mode instabities in semiconductor lasers. Two examples are presented: the classic "kink" instability and an injection induced mode hop.
 
 
CWF80 14:30 - 16:00
Output Power Changes in Laser Diodes Subject to Sub-Wavelength Variations in External Cavity Length: Theory and Experiment, Robin Jones, Paul Spencer, K. Alan Shore, University of Wales, Bangor, Wales, UK, J.S. Lawrence, D.M. Kane, Macquarie University, Sydney, NSW, AUSTRALIA
Sub-wavelength movement of the external reflector causes changes in the stability of external cavity laser diodes. Excellent agreement has been obtained between experimental results and theoretical calculations.
 
 
CWF81 14:30 - 16:00
Root-Locus Technique for Predicting the Stability of Laser Diodes with Optical Feedback, Iestyn Pierce, Paul Rees, Paul Spencer, University of Wales, Bangor, Bangor, Wales, UK
The maximum allowed feedback strength into a diode laser is calculated using the root locus technique from control theory. New results, including islands of stability, are predicted for short cavities.
 
 
CWF82 14:30 - 16:00
A Simple Analytical Non-Lorentzian Approximation for the Complex Lineshape Function for Semiconductor Laser Modelling, E.A. Avrutin, University of York, Heslington, York, UK
An analytical, non-Lorentzian approximation for the complex lineshape function of the radiative transition, faciliatating single-and many body microscopic modeling of gain and refraction in semiconductor lasers, is proposed and analysed.
 
CWF83 14:30 - 16:00
Hot Phonons in Quantum Cascade Lasers, Vincenzo Spagnolo, Mariano Troccoli, Universita di Bari, Bari, ITALY, Gaetano Scamarcio, Universita di Bari, Bari, ITALY, Claire Gmachl, Alessandro Tredicucci, Federico Capasso, Albert Hutchinson, Deborah Sivco, Alfred Cho, Lucent Technologies Bell Laboratories, Murray Hill, NJ, USA
We report evidence of non equilibrium population of interface phonons in cw operated quantum cascade lasers, obtained by micro-probe Raman and photoluminescence measurements. Interface phonon lifetimes of 1ps (0.8ps) at 116K (193K) lattice temperatures are estimated.
 
 
CWF84 14:30 - 16:00
New Semiconductor Lasers Based on Intraband Transitions of Injected Carriers in Quantum Wells, L. Vorobjev, S. Danilov, St. Petersburg Technical University, St. Petersburg, RUSSIA, G. Zegrya, Russian Academy of Sciences, St Petersburgh, RUSSIA, V.L. Zerova, D. Firsov, V.A. Shalygyn, St. Petersburg Technical University, St. Petersburg, RUSSIA
Two designs of mid infrared quantum well intersubband lasers are suggested. The features of new mechanisms of population inversion are simultaneous generation of mid and near infrared radiation, resonant Auger recombination and Auger pumping.
 
 
CWF85 14:30 - 16:00
InGaAsSb(Gd)/InAsSbP Double Heterostructure Lasers l=3.0÷3.3 µm for Diode Laser Spectroscopy, N. Zotova, M. Aidaraliev, A.F. Ioffe Physicotechnical Institute, St. Petersburg, RUSSIA, T. Beyer, Fraunhofer Institut (IAF), Freiburg, GERMANY, S.A. Karandashov, A.F. Ioffe Physicotechnical Institute, St. Petersburg, RUSSIA, B.A. Matveev, M.A. Remennyi, N.M. Stus, G.N. Talalakin, A.F. Ioffe Physicotechnical Institute, St. Petersburg, RUSSIA
Double heterostructure diode lasers based on InGaAsSb(Gd)/InAsSbP (l=3.0÷3.3 µm, 50/107 K) have single mode operation up to 6-Jth, spectral purity 650:1, tuning rate 210 cm-1/A. Methane gas detection at 3028.75 cm-1 is demonstrated.
 
 
CWF86 14:30 - 16:00
Growth of GaInNAs/GaAs Quantum Well Lasers by Plasma-Assisted Molecular Beam Epitaxy, Zhong Pan, L.H. Li, CHINA, W. Zhang, Y.W. Lin, R.H. Wu, Chinese Academy of Science, Beijing, CHINA
GaInNAs was grown by an ion-removed dc-plasma assisted MBE. A kinetic model considering the N desorption and surface segregation was established to analyze the N incorporation. Optimum growth conditions were obtained and GaInNAs/GaAs QW lasers were achieved.
 
CWF87 14:30 - 16:00
Diffusion Dynamic Model for Study of the Nonuniform Carrier Distribution Effects in VCSEL, P.S. Ivanov I.A. Sukhoivanov, Kharkov State Tech Univ of Radio Elect, Kharkov, UKRAINE
We present a new dynamic model which takes into account irregular carrier distribution in the oxide confined VCSEL. The obtained results are shown a possibility to simulate a dynamic behavior and to optimize the window position.
 
 
CWF88 14:30 - 16:00
Lineshape and Frequency Noise of a Vertical Cavity Surface Emitting Laser, S. Viciani, Francesco Marin, Universita di Firenze, Firenze, ITALY
We present an experimental analysis of lineshape and frequency noise of a Vertical Cavity Surface Emitting Laser. The lineshape is a Lorentzian curve plus a quasi-Gaussian contribution originated by excess noise whose spectrum is analyzed.
 
 
CWF89 14:30 - 16:00
Development and Performance of Visible Red VCSELs, Jochen Schwarz, R. Butendeich, D. Graef, T. Ballmann, M. Ubl, H. Graebeldinger, F. Scholz, H. Schweizer, Universitaet Stuttgart, Stuttgart, GERMANY
We developed red VCSELs (650 nm to 676 nm) with cw-threshold currents down to 5 mA, maximum output up to 3 mW at room temperature. We also investigated cavity loss and gain in our VCSELs.
 
 
CWF90 14:30 - 16:00
Analytical Calculation of Transverse Mode Characteristics in Vertical-Cavity Surface-Emitting Lasers, A. Valle, Luis Pesquera, Instituto de Fisica de Cantabria, Santander, SPAIN
An analytical calculation of the multi-transverse mode Light-Current characteristics of index-guided VCSELs taking into account spatial effects is presented. Obtained results are in good agreement with numerical results of previously reported models.
 
 
CWF91 14:30 - 16:00
Self-Consistent Modelling of VCSELs with Non-Cylindrical Geometry, Krassimir Panajotov, Institute of Solid State Physics, Brussels, BELGIUM, Michael Peeters, Irina Veretennikoff, Vrije Universiteit Brussel, Brussels, BELGIUM
VCSELs with noncylindrical geometry are modelled using finite-difference alternating-direction method in time-domain. The optical problem is coupled to the carrier diffusion problem and the polarisation resolved light versus current characteristics are calculated.
 
 
CWF92 14:30 - 16:00
Transverse Mode Measurements in Index Guided Vertical Cavity Semiconductor Lasers, John McInerney, Stephen Hegarty, Guillaume Huyet, Pierpaolo Porta, National University of Ireland, Cork, IRELAND, Kent Choquette, Kent Geib, H. Hou, Sandia National Laboratories, Albuquerque, NM, USA
We have measured transverse spectra of oxide confined vertical cavity semiconductor lasers of various sizes. Thermal lensing dominates at small apertures while at large apertures single high-order modes can occur if the cavity is detuned.
 
 
CWF93 14:30 - 16:00
Correlation Between Laser Pattern and Local Carrier Distribution in VCSELs Determined by Microprobe Electroluminescence, Maurizio Dabbicco, Vincenzo Spagnolo, Mariano Troccoli, Caterina Marinelli, Gaetano Scamarcio, Universita di Bari, Bari, ITALY, Jim Tatum, Honeywell Micro Switch, Richardson, TX, USA
Transverse mode dynamics in VCSELs is primarily driven by locally inhomogeneous current and temperature distributions. We estimate these critical parameters by spatialy resolved electroluminescence experiments and find a strong correlation between the mode switching and the luminescence profile.
 
 
CWF94 14:30 - 16:00
Single-Mode Vertical Cavity Surface-Emitting Lasers Grown Under Accurate Real-Time Optical Control, F. Van Dijk, V. Bardinal, P. Dubreuil, L. Averseng, E. Bedel-Pereira, Chantal Fontaine, A. Munoz-Yaguee, LAAS - CNRS, Toulouse 4, FRANCE
A real-time optical control technique has been applied to the precise growth of AlGaAs/ GaAs-based Vertical-Cavity Surface-Emitting Lasers (VCSELs). High uniformity at the aimed laser wavelength, very low threshold currents and single-mode operation have been obtained.
 
CWF95 14:30 - 16:00
Novel Quantum Well Intermixing in InGaAs-InGaAsP Laser Structure Using Argon Plasma Exposure, T. C. L. Wee, Boon Siew Ooi, T.K. Ong, Yee-Loy Lam, Yuen Chuen Chan, Geok Ing Ng, Nanyang Technological University, SINGAPORE
We report a novel quantum well intermixing technique in InGaAs-InGaAsP material using Argon plasma exposure. A maximum bandgap shift of 72 meV has been obtained. High quality bandgap-tuned lasers have been fabricated using this technique.
 
CWF96 14:30 - 16:00
Pulsed-Laser-Induced Quantum Well Intermixing in GaInAs/GaInAsP Laser Structures, T.K. Ong, Boon Siew Ooi, Yee-Loy Lam, Yuen Chuen Chan, Y. Zhou, Nanyang Technological University, Nanyang Avenue, SINGAPORE
The microstructures of GaInAs/GaInAsP laser material after pulsed-laser-induced disordering utilizing a Q-switched Nd:YAG laser has been studied using transmission electron microscopy. High quality bandgap-tuned lasers have been fabricated using this high spatial resolution intermixing process.
 
 
CWF97 14:30 - 16:00
High-power 1.52-µm AlGaInAs Strained Multi-Quantum Well Lasers, Timothy Newell, P. Varangis, E. Pease, A. Stintz, Guangtian Liu, K.J. Malloy, Luke Lester, University of New Mexico, Albuquerque, NM, USA
High power operation of AlGaInAs/InP strained QW lasers is presented. The variation in the external differential efficiency with cavity length and temperature reveals the optimum length and shows how nonradiative recombination mechanisms limit the performance.
 
CWF98 14:30 - 16:00
Optimisation of InGaN Narrow Stripe Self-Pulsating Laser Diodes, Dewi Jones, Paul Rees, Iestyn Pierce, University of Wales, Bangor, Wales, UK
Self-pulsating laser diodes are required in optical storage systems. A theoretical model of a blue narrow stripe self-pulsating laser is optimised to obtain high temperature and low current density operation.
 
 
CWF99 14:30 - 16:00
Influence of Mounting Stress on Polarisation Degree of Electroluminescence of Laser Diode Bars, Ralf Staske, J. Sebstian, H. Wenzel, G. Erbert, Ferdinand-Braun-Institut, Berlin, GERMANY, H.G. Haensel, GmbH, Jena, GERMANY
The analysis of the polarisation degree of electroluminescence below laser threshold is used for the investigation of correlation between mounting procedure and lifetime behaviour of laser diode bars. It is suitable for optimisation and selection.
 
CLEO/Europe Poster Session
Room: Mediterrané
14:30 - 16:00
 
 
CWF100 14:30 - 16:00
A Sampled Grating Distributed Bragg Reflector Laser Diode for Spectroscopic Based Multi-Gas Detection at 1.5µm, Karl Boylan, V. Weldon, D. McDonald, Trinity College of Dublin, Dublin, IRELAND, J. Rawsthorne, Marconi Caswell Limited, Northamptonshire, UK, James O'Gorman, Trinity College of Dublin, Dublin, IRELAND, John Hegarty, Trinity College, Dublin, IRELAND
A widely tunable laser with a wavelength tuning range of 50nm is used for simultaneous sensing of several gases. We assess its performance for gases such as acetylene and carbon dioxide at 1.5 µm.
 
 
CWF101 14:30 - 16:00
Hollow Waveguide Integrated Optic Systems with Integrated Laser Sources for 10.6 Micron Laser Radar, R.M. Jenkins, R. Foord, A.F. Blockley, J. Quarrell, R.W.J. Devereux, Defense Evaluation & Research Agency, Malvern, Worcestershire, UK, G.M. Miller, Ferranti Photonics, Dundee Scotland
The design, manufacture and assesment of a hollow waveguide intergrated optics laser radar system with an integrated laser source is described. The work represents an important step towards the goal of creating fully integrated 10.6 micron laser radar systems.
 
 
CWF102 14:30 - 16:00
Benzene Monitoring Using Laser Difference Frequency Spectroscopy, Weidong Chen, Fabrice Cazier, , Daniel Boucher, Universite de
Littoral, Dunkerque, FRANCE, Frank Tittel, Rice University, Houston, TX, USA
Benzene concentration measurements based on high-resolution laser absorption spectroscopy of benzene in the v4R(6) branch are reported. The measurements were performed with a tunable continuous wave, mid-infrared spectroscopic source using laser difference frequency generation in GaSe. A detection limit of ~1 ppm-m path-integrated benzene concentration was realized at a reduced pressure of 40mbar.
 
 
CWF103 14:30 - 16:00
Rapidly Tunable 2,5 kW CO2 Laser Operating in Single-Frequency and Two-Wavelength Modes for Pollution Monitoring, Lidar and Scientific Applications, Sergei Bagayev, Gennadiy Grachev, V.F. Zakharyash, V.M. Klementyev, V.A. Orlov, A.G. Ponomarenko, A.R. Sametov, Victor Shulyat'ev, Russian Academy of Sciences, Novosibirsk, RUSSIA
A rapidly tuanble 2,5 kW CO2-laser that can operate in continuous, pulse-periodic (pulse power up to 800kW, repetition frequency of up to 100kHz), single-frequency, and two-wavelength modes(control of the spectrum in the range of ~ 70 lines) is presented. It is shown that its use in the system of Doppler location, distance measurements, and monitoring of pollutions at large (up to 20-50 km) radius of action is promising.
 
 
CWF104 14:30 - 16:00
Atmospheric Gas Trace Detection with Ultrashort Pulses or White Light Continuum, H. Delbarre, M. Tassou, Universite du Littoral, Dunkerque, FRANCE
We couple ultashort sources in the visible and ultraviolet ranges such as femtosecond pulses or a white-light continuum, a long optical path cell and a spectrometer to detect gas traces in ambient air at atmospheric pressure.
 
 
CWF105 14:30 - 16:00
Cavity Ring Down with Optically Coupled Diode Laser Applied to Ultra-Sensitive Atmospheric Trace Detection,
Jerome Morville, D. Romanini, A. Katchanov, M. Chenevier, Universite Joseph Fourier, St. Martin d'Heres, FRANCE
We present an optical servo-control of a diode laser coupled to an optical cavity to carry out Cavity Ring Down Spectroscopy. It uses the polarization eigenstates of the cavity. We obtain an ultra-sensitive (10-8 /cm) atmospheric trace detection technique.
 
 
CWF106 14:30 - 16:00
Laser Depth Measurement Using Picosecond Resolution Time Correlated Single-Photon Counting, Sara Pellegrini, Gerald Buller, Andrew Wallace, Heriot-Watt University, Edinburgh, UK
The performance of a time-of-flight ranging/scanning system based on the time-correlated single-photon counting is analysed. Depth resolution is shown experimentally and by computer simulation for intergrated returns ranging from 106 to only 10 photons.
 
 
CWF107 14:30 - 16:00
Intracavity Absorption Spectroscopy from 1.7 to 2µm with Thulium-Doped Fibre Laser, Arnold Stark, L. Correia, S. Salewski, Universitaet Hamburg, Hamburg, GERMANY, C. Larsen, Lucent Technologies Denmark A/S, Brondby, DENMARK, V.M. Baev, P.E. Toschek, Universitaet Hamburg, Hamburg, GERMANY
Thulium fibre laser multimode emission shows intracavity absorption of H2O, CO2 etc., with 10 km effective path length. Absorption analysis involves time resolving rapid scan Fourier spectrometer or combination of laser modulation with photoacoustic detection.
 
 
CWF108 14:30 - 16:00
Narrow Linewidth Optical Parametric Oscillator for Photoacoustic Spectroscopy, T. Debuisschert, J.-M. Dupont, J. Raffy, Thomson CSF LCR, Orsay, FRANCE, Jean Paul Pocholle, Thomson CSF LCR, Orsay, FRANCE
A nanosecond optical parametic oscillator has its spectral linewidth reduced down to 0.08 cm-1 thanks to a Fabry-Perot filter. It is used for photoacoustic spectroscopy with 500 ppb sensitivity on CH4 concentration measurement.
 
 
CWF10 9 14:30 - 16:00
Laser Absorption Spectroscopy of Atmospheric Formaldehyde, Frank Tittel, Dirk Richter, D. Rehle, D. Leleux, D.G. Lancaster, M.P. Fraser, Rice University, Houston, TX, USA, A. Fried, National Center for Atmospheric research, Boulder, CO, USA
High sensitivity detection of formaldehyde in ambient air at 3.5315µm(2831.64 cm-1) is reported using a spectroscopic source based on difference frequency generation in periodically poled LiNbO3. CH2O spectra are recorded using 2f-detection and rapid background subtraction with a precision of <250 ppt and a minimum detectable absorbance of 10-5.
 
 
CWF110 14:30 - 16:00
Wavefront Measurement Using Electro-Optic Scanning with a Liquid-Crystal SLM, V. Laude, S. Olivier, C. Dirson, Jean-Pierre Huignard, Thomson CSF LCR, Orday, FRANCE
A wavefront sensor is presented that uses a programmable moving aperture to scan an incident wavefront. A practical implementation with a liquid-crystal spatial light modulator is presented. It offers high accuracy together with a large dynamic range and is free from
ambiguities which affect classical Hartmann-Shack sensors. Experiments with ophtalmic lenses are demonstrated.
 
 
CWF111 14:30 - 16:00
Radar Modulation on Optical Carrier for Target Detection in Sea-Water, Fabrice Pellen, P. Olivard, Y. Guern, J. Cariou, J. Lotrian, Universite de Bretagne Occidentale, Brest, FRANCE
Radar modulation on optical carrier in association with a suitable filtering reduces the volume backscattering contained a LIDAR signal, and thus allows a better detection of targets immersed in sea-water.
 
 
CWF112 14:30 - 16:00
Operation Conditions of Eyesafe Lidar at 1.54 µm for Detection of Smoke Plumes, Rui Vilar, Instituto Superior Tecnico, Lisboa, PORTUGAL, Alexander Lavrov, Russian Scientific Center, St. Petersburg, RUSSIA
Operation conditions of lidar at 1.54µm for detection of plumes of smoke from burning wood or oil have been evaluated. Results of the computations enabled estimation of laser energy, which ranges from 0.05 to 510mJ.
 
 
CWF113 14:30 - 16:00
Optical Diagnostic of Silicon Carbide Based on Differential Reflectance Spectroscopy, A.V. Shturbin, Ilya Titkov, V. Yu. Panevin, St. Petersburg Technical University, St Petersburg, RUSSIA, R.F. Witman, Russian Academy of Sciences, St. Petersburg, RUSSIA
A simple non-destructive method for characterising SiC samples (lely-crystals, CREE-substrates, and epitaxial films) is presented. Structural quality of the samples was estimated by ultraviolet differential reflectance spectroscopy.
 
 
CWF114 14:30 - 16:00
Atmospheric Turbulence Measurements by Angle of Arrival Fluctuations and Intensity Scintillations with Large Aperture, Yaakov Glick, Reurem Zaibel, G. Bar-Tal, Y. Bar-Sagi, Soreq NRC, Yavne, ISRAEL
Atmospheric turbulence is measured with a one-station scheme, over a 1500m distance by angle of arrival (AOA) fluctuations and by intensity scintillations. The scintillations are shown to saturate while the AOA measurements do not.
 
CWF115 14:30 - 16:00
Extended Band Erbium Amplified Spontaneous Emission Source, Martin Berendt, W.A. Arellano, Ildefonso de Faria, Hugo Fragnito, UNICAMP, Campinas, SP, BRAZIL
We propose a simple Erbium broadband source suited for characterization of optical components in the 1500nm to 1640nm range. The source combines conventional and shifted Amplified Spontaneous Emission, using only one pump laser.
 
CWF116 14:30 - 16:00
Transportable Multiple-Mirror Rayleigh/Raman LIDAR, F. Congeduti, Istituto di Fisica dell'Atmosfera, Rome, ITALY, S. Casadio, European Reseach Institute, Frascati, ITALY, D'Aulerio, Universita La Sapienza, Rome, ITALY, P. Baldetti, Spazio Interplanetario, Rome, ITALY, F. Belardinelli, Istituto di Fisica dell'Atmosfera, Rome, ITALY
A transporatable Rayleigh/ Raman LIDAR is described. The two-wavelength multiple-mirror system is used to profile aerosol and water vapor from the boundary layer through the tropopause.
 
 
CWF117 14:30 - 16:00
Water Vapour Mixing Ratio and Ozone Measurements by a Solar Blind Raman Lidar, Ferdinando De Tomasi, G. Torsello, Maria Rita Perrone, Universita di Lecce, Lecce, ITALY
We present a method to obtain the differential transmissivity needed in retrieving water vapour mixing ratio by solar blind Raman lidar measurements, which is utilisable when using KrF laser. The method is based on the determination of ozone by total extinction measurement and exploit the high absorption of ozone in this spectral range.
 
 
CWF118 14:30 - 16:00
Methodology for In Situ Laser-Induced Fluorescence Spectral Analysis: Application to Macroalgae Recognition,
Christelle Kieleck, G. Le Brun, B. Bousquet, J. Cariou, J. Lotrian, Universite de Bretagne Occidentale, Brest , FRANCE
The knowledge of efficient fluorescence and reflectance wavelengths allowing discrimination among algal groups while considering water transmission properties led us to design an imaging algorithm capable of spatially and taxonomically identify one alga placed among others.
 
 
 
CWF119 14:30 - 16:00
Laser Beam Characterization by Using a Shack-Hartmann Sensor, Johannes Pfund, J. Schwider, Universitaet Erlangen-Nuernberg, Erlangen, GERMANY
In many industrial applications the diagnostic of laser beams is very important. The principle of the measurement of the propagation characteristics of laser beams with a Shack-Hartmann sensor is described together with some experimental results.
 
CWF120 14:30 - 16:00
Can the Optical Tweezer Effect be a Problem in Interferometry? Maria Diaz-Garcia, Universidad Miguel Hernandez, Elche, Alicante, SPAIN, William Torruellas, Washington State University, Pullman, WA, USA, Stuart Shaklan, JPL, Caltech, CA, USA
We investigate the consequences of the optical tweezer effect in interferometric instrumentation. In certain conditions, due to this effect, particles can be attracted towards the laser sources, deteriorating the wave-form performance of the systems.
 
 
CWF121 14:30 - 16:00
Electronic Speckle Pattern Interferometry With Violet Semiconductor Lasers, Valery Petrov, FIBA, Ulm, GERMANY
Novel semiconductor laser emitting in the violet part of visible spectrum (397 nm,5 mW) was used for the first time in electronic speckle pattern interferometry. Quasi-real time monitoring of dynamics of thermal fields was performed in a very compact device with
violet laser. Such an interferometer can be used in microelectronic industry.
 
 
CWF122 14:30 - 16:00
Study of Spectropolarization Contrasts of Natural Backgrounds and Artificial Objects, B.I. Belyaev, Yu. V. Belyaev, L.V. Katkovsky, Institute of Applied Sciences, Minsk, BELARUS, T.M. Kurikina, V.I. Shuplyak, Belarusian State University, Minsk, BELARUS
It was determined the most informative spectropolarization attributes, spectral and angular intervals, using of which could promote display of maximum contrasts between natural and artificial objects both in spectropolarization and image remote sensing
 
 
CWF123 14:30 - 16:00
CO2-TEA Laser-Based Lidar-Dial System to Monitor the Effect of Heavy Traffic on the Dynamics of Ozone in the Urban Atmosphere of Madrid, T. Gasmi, Universidad Complutense, Madrid, SPAIN, H. Zeaiter, University Europea CEES, Madrid, SPAIN, G. Ropero, C. Yusta, A. Gonzalez Urena, Universidad Complutense, Madrid, SPAIN
The paper demonstrates the capability of the Lidar-Dial system to monitor the significant increase of ozone concentration and its longer persistence in the urban atmosphere due to summer heavy vehicle traffic conditions. The usual daily profile of O3 shifts towards late hours despite the low photochemical activity. A direct correlation was found between the ozone concentration and its persistence
in the air with the density of the vehicle traffic.
 
 
CWF124 14:30 - 16:00
Interference Device for Roughness Measurement, P.P. Maksimyak, O.V. Angelsky, Chernivtsy University, Chernivsty, UKRAINE
The relationship between statistical structure parameters of rough surface and associated correlation parameters of scattered fields is used to develop a method for rough surface daignostics. The sensitivity limit of the method in measuring the standard deviation of surface profile from base line is about 0.003 µm.
 
CWF125 14:30 - 16:00
Method of Laser Monitoring of Oil Pollution in Sea Water (in situ) using Variable Strobing, Non-linear Fluorimetry, and Artifical Neural Networks Techniques, I.V. Boychuk, Moscow State University, Moscow, RUSSIA, Tatiana Dolenko, V.V. Fadeev, Moscow State University, Moscow RUSSIA, M. Kompitsas, Theoretical and Physical Chemistry Institute, Athens, GREECE, R. Reuter, Carl von Ossietzky Universitat Oldenburg, Oldenburg, GERMANY
The possibility of oil pollutants determination in sea water volume (in situ) by laser-induced fluorescence registration by means of variable strobing, non-linear fluorimetry, and artificial neural networks technique is discussed in the report.
 
 
CWF126 14:30 - 16:00
Interferometry for Rough Surface, Hideo Sakuma, Tokyo Metropolitan University, Tokyo, JAPAN
A technique of interferometry for rough surface is attempted. By sticking thin film to the surface, the interference fringes are observed. The stuck film acts as a low pass filter for the surface profile.
 
 
CWF127 14:30 - 16:00
Sonic Velocity Measurement by Using Bragg Reflection Detection Technique Based on Optical Feedback Effects for Laser Diode, Atsushi Yarai, Takuji Nakanishi, Osaka Sangyo University, Daito, Osaka, JAPAN
This paper proposes an ultrasonic measurement technique by using Bragg reflection detection instrument that is based on optical feedback effects for a laser diode (LD). This instrument features the use of LD as an optoelectronic device.
 
 
CWF128 14:30 - 16:00
Tunable Laser Diode ESPI for High Precision In-Plane Rotation Measurement, Alain Cornet, Abdel Karim Nassim, Universite Catholique de Louvain, Louvain-la-Neuve, BELGIUM
A simple ESPI method is presented for the measurement of small in-plane angle of rotation of a mechanical part of a machine. The technique is based on fringes tilt measurement on grabbed laser speckle correlograms. A tunable laser diode is used in such a way to produce reference fringes on static objects. The method increases by a factor 1,000 the fringes tilt relatively to the in-plane object rotation. Example of fine measurement of pulling untightening of threaded screws is discussed. Security and reliablity of mechanical assembles can be studied with this technique.
 
 
CWF129 14:30 - 16:00
Position Sensing with a Shack-Hartmann Wavefront Sensor, Jorge Ares, Justo Arines, Salvador Bara, Universidad de Santiago de Compostela, Galicia, SPAIN
The use of a Shack-Hartmann sensor is demonstrated for positioning a luminous pointlike object. Rms axial and angular accuracies of 74µm(at 300 mm) and 4.3 µrad, respectively, can be easily achieved.
 
 
CWF130 14:30 - 16:00
LIDAR/DIAL Gas Detection of Atmosphere Pollutants with H2O Calibration, V.O. Petukhov, V.A. Gorobets, A.A. Matsukevich, National Academy of Sciences of Belarus, Minsk, BELARUS
The technique of a OÅA CO2 LIDAR/DIAL gas detection of atmosphere pollutants concentration with H2O calibration has been designed. For approbation of this technique the measurements of carbon monoxide content on the path near the motor road located in Minsk city have been made.
 
 
CWF131 14:30 - 16:00
Two-Wavelength Lidar for Atmosphere Monitoring in Urban Area, Trifon Trifonov, Boyan Tatarov, Miroslav Pendev, Boiko Kaprielov, Ivan Kolev, Bulgarian Academy of Sciences, Sofia, BULGARIA
The paper presents estimations of the spectral transmittance of the atmosphere determined using a two-wavelength aerosol lidar. The experimental investigations presented show the ability of the two-wavelength lidar to register variation in either optical and microphysical characteristics of the sounded aerosols.
 
 
CWF132 14:30 - 16:00
Wide Range Coordinate-Sensitive Photodetector for Laser Controlled Systems, A.V. Shturbin, V.A. Shalygyn, Ilya Titkov, V.L. Zerova, St. Petersburg Technical University, St. Petersburg, RUSSIA
A design of coordinate-sensitive photodetector is presented. The main features are detectors keeps a linear coordinate sensitivity in a broad range; never could be blinded; does not need contacts to the sensing cell.
 
 
CWF133 14:30 - 16:00
A Novel PIV Technique Using One Frame of Image, Shimin Wang, Mao Ye, Yiqian Xu, Southeast University, Nanjing, CHINA
Abstract not available.
 
 
CWF134 14:30 - 16:00
Image Processing Techniques for Increasing the Dynamic Range of a Shack-Hartmann Positioner, Justo Arines, Jorge Ares, Salvador Bara, Universidad de Santiago de Compostela, Galicia, SPAIN
The dynamic range of Shack-Hartmann sensor positioners can be enhaced by using image processing techniques in centroid determination tasks. Computer simulations for low noise levels demonstrate accuracies of the order of 0.007 pixel rms.
 
 
 
CWF135 14:30 - 16:00
Speckle Interferometry with Ring Aperture, MIchael Osipov, Maxim Shaposhnikov, Samara State University, Samara, RUSSIA
Theoretical and the experimental studies of application of the ring apertures in the optical system for speckle interferometry are presented. It allows to increase sensitivity, accuracy and effective range of measurements of the speckle interferometry method.
 
 
CWF136 14:30 - 16:00
Influence of Wave Inclination on the Reconstruction Properties of a Phase Multiple Holographic Transmission Grating, L. Zizi, B. Ferhat, Laboratoire de Physique des Lasers, Alger, ALGERIA
The grating behavior is analyzed along several measured configurations. The results show that waves inclination effect and the manner they are coupled can allow a variation of the reconstructed relative intensities.
 
CWF137 14:30 - 16:00
Spatial Resolution of Nonlinear Refractive Index and Third-Order Susceptibility Measurements by Mach-Zehnder Interferometry Technique, Georges Boudebs, K. D. Dorkenoo, M. Chis, X. Nguyen Phu, Laboratoire POMA, Angers 01, FRANCE
We report a new technique appropriate to measure the third-order susceptibility. This technique is based on the Mach-Zehnder interferometer. The novelty here is our numerical processing method which allows the resolution of the spatial profile of the nonlinear variation index. Only one shot is needed to obtain a great number of measurements.
 
 
CWF138 14:30 - 16:00
Near-Infrared Seeded Cavity Ring-Down for Trace Gas Detection, E. Poullet, J. Burie, Universite du Littoral, Dunkerque, FRANCE
Realization of a setup combining a high resolution technique (the cavity-ring-down), and an intracavity difference frequency generation, allows sensitive detection of most atmospheric trace pollutants (like V.O.C.) in the near infrared region.

 
 
IQEC POSTERS
 
IQEC Poster Session Room: Mediterranee
14:30 - 16:00
 
 
QWD1 14:30 - 16:00
Experimental Observation of Electromagnetically Induced Transparency in a Four-Level N - Type Scheme in87Rb, V.M. Entin, I. I. Ryabtsev, Institute of Semiconductor Physics, Novosibirsk, RUSSIA
The first experimental observation of the electromagetically induced transparency in a four-level nondegenerate N-type scheme at D2 absorption line of 87Rb is reported. The effect was observed with using the three-frequency laser field. The behavior of the resonances in weak magnetic field and dependencies on laser intensity and polarization have been investigated.
 
QWD2 14:30 - 16:00
Influence of the Doppler Effect on the Shape of Lambda-Resonance in Gas, A. V. Taichenachev, A. M. Tumaikin, V. I. Yudin, Novosibirsk State University, Novosibirsk, RUSSIA, A. S. Zibrov, Texas A&M University, College Station, USA, V. L. Velichansky, Texas A&M University, College Station, TX, USA, Leo Hollberg, Marlan Scully, NIST, Boulder, CO, USA,
The Doppler effect is shown to decrease the width of a L-resonance as compared to that for homogeneous brodening, even when the residual two-photon Doppler broading is negligible. It is confirmed by experiment.
 
 
QWD3 14:30 - 16:00
Electromagnetically Induced Transparency in a Thin Film, David Petrosyan, FO.R.T.H. - I.E.S.L., Heraklion, Crete, GREECE, Yuri Malakayan, Armenian National Academy of Sciences, Ashtarek, ARMENIA
We examine the features of the effect of electromagnetically induced transparency in an ultrathin cell filled with a vapor of three-level L-atoms and show the unusual absorptive and dispersive properties of the medium conditioned merely by the slowest atoms having an effective 1 mK temperature.
 
 
QWD4 14:30 - 16:00
Possibility for Observation of the Narrow Resonances of the Saturated Absorption and Dispersion, T. V. Radina, St. Petersburg State University, Petrodvoretz, RUSSIA
Results are presented of theoretical studies into the resonances of the saturated absorption and saturated dispersion in an external absorption cell. The theory has been worked out by means of combining methods of mathematical theory of diffraction and quantum mechanical method.
 
 
QWD5 14:30 - 16:00
Parametric Dispersion in Coherent Population Trapping Systems, M. Mueller, F. Homann, R.-H. Rinkleff, K. Danzmann, Universität Hannover, Hannover, GERMANY
In a lambda type tree level system the phase of the resonant coupling field is investigated in dependence of the detuning of the probe field. The power of the laser fields is varied over several orders of magnitude.
 
QWD6 14:30 - 16:00
Analysis of the Properties of the Time-Domain Bordé Atom Interferometry, Shinya Yanagimachi, University of Tokyo, Noda-shi, Chiba, JAPAN, K. Shinohara, Atsuo Morinaga, Science University of Tokyo, Chiba, JAPAN, T. Trebst, F. Riehle, Physikalisch-Technische Bundesanstalt, Braunschweig, GERMANY
Properties of the time-domain Bordé atom interferometer with various sequences of pulsed laser are well described in comparison with experimental results by an analytical method using the geometrical trajectories of the atomic waves.
 
 
QWD7 14:30 - 16:00
Dopplerless Spectroscopy of 6S1/2-81/2, 3/2 Transitions of Cold Atomic Caesium, Jean-Luc Bossennec, Tangi Miossec, Laboratoire de Physique des Lasers, Villetaneuse, FRANCE, Olivier Gorceix, René Barbé, Jean-Claude Keller, Universite Paris-Nord, Villetaneuse, FRANCE
We present Dopplerless spectroscopy of atomic caesium confined and cooled in a magneto-optical trap. We demonstrate the resolution of the hyperfine structure of the 8P1/2,3/2 Levels. The metrological potentialities are illustrated.
 
 
QWD8 14:30 - 16:00
Cs Vapor Cells : Absorption and Fluorescence May Vary by Several Orders of Magnitude, David Sarkisyan, Yuri Malakayan, A Papoyan, Institute for Physical Research, Ashtarek, ARMENIA, G Bison, A Weis, Institut fuer Angewandte Physik, Bonn, GERMANY
We found a dramtic dependence of the D2-resonance absorption and fluorescence of Cs vapour on laser intensity, magnetic field and scan rate and direction in 8 µm and in 1 cm Cs and Cs-Ne mixture cells.
 
 
QWD9 14:30 - 16:00
A Dense Grid of Reference I2-Lines for Optical Frequency Calibration in the Range 571-655 nm, W. Ubachs, Iavor Veltchev, S.U. Xu, R. van Dierendock, Wim Hogervorst, Vrije Universiteit, Amsterdam, THE NETHERLANDS
Based on measurements of hyperfine components of 600 new rotational lines in 21 bands of the B-X system of I2 a grid of predicted lines for wavelength calibration is produced covering the range 571-655 nm with a reference line in each interval of 1 cm-1.
 
 
QWD10 14:30 - 16:00
Ultra-high Resolution Spectroscopy in the Infrared Region using a Supersonic Beam of SF6, A. Shelkovnikov, L.F. Constantin, A. Amy-Klein, R.J. Butcher, Ch. Chardonnet, Universite Paris 13, Villetaneuse, FRANCE
We have developed a two-photon Ramsey fringes experiment at 10µm, using a supersonic beam of SF6. With separations up to 20 cm between zones, we obtained typical linewidths of 1kHz.
 
 
QWD11 14:30 - 16:00
Towards an Optical Frequency Standard Based on a Single Ca+ Ion in a Miniature Trap, Martina Knoop, Mustapha Herbane, Marie Houssin, Michel Vedel, Fernande Vedel, Universite de Provence, Marseille 20, FRANCE
A single Ca+ ion confined in a miniature trap is a promising candidate for an optical frequency standard. Its major advantage is the wavelength scheme in the optical domian being completely accessible by all-solid-state lasers.
 
QWD12 14:30 - 16:00
Variation of the Mechanism of Ba2+ Ions Formation During Multiphoton Ionisation of Atoms, V. V. Suran, I. I. Bondar, Uzhgorod State University, Uzhgorod, UKRAINE
It was discovered that additonal perturbation of Ba atoms by laser radiation during ionization by visible laser radiation leads to the variation of the mechanism of doubly-charged ions formation from step-wise to direct two-electron.
 
 
QWD13 14:30 - 16:00
Precision Stark Shift Measurements in Rubidium Using an Electro-Optically Modulated Laser Beam, W. van Wijngaarden, J. Walls, J. Clarke, York University, Toronto, ON, CANADA
Stark shifts are determined using an electro-optically modulated laser beam to excite an atomic beam. The voltage required for atoms excited by the laser beam in an electric field to be simultaneously in resonance as atoms excited by a frequency sideband of the laser in a field free regions, is measured. We are studying excited S and D states of rubidium that are stepwise excited using diode and ring dye lasers. The measured stark shifts permit the determination of the scalar and tensor polarizabilities which can be used to test theory.
 
QWD14 14:30 - 16:00
Laser-Induced Antiproton - Positron Recombination, Leonid Melnikov, M. V. Ryabinina, Saratov State University, Saratov, RUSSIA
The detailed calculation of the probability of laser-induced recombination and antihydrogen formation rate to the state n=1...10 is presented.
 
 
QWD15 14:30 - 16:00
Rydberg Series of Hf Atoms by Resonance Ionization Spectroscopy, Shuichi Hasegawa, Susumu Tanji, Hitoshi Kurosawa, Atsuyuki Suzuki, University of Tokyo, Tokyo, JAPAN
Resonance ionization spectroscopy of Hf atoms was performed to investigate highly excited states. We report that the Rydberg series converging to the first ionization limit were identified with two color excitation.
 
 
QWD16 14:30 - 16:00
Ionization and Fragmentation of Small Molecules Under Intense Short Pulse Laser Radiation, E. Koudoumas, X. Michaut, Costas Fotakis, S. Couris, FORTH-IESL, Heraklion, Crete, GREECE
Experimental results are presented related to the ionization and fragmentation of OCS, CO2, CH3I and CCI4 During their interaction with intense short pulse duration laser radiation.
 
 
QWD17 14:30 - 16:00
Symmetry-Breaking Rotational Energy Transfer in Acetylene Molecules, Induced by Collisional and/or Infrared Fields, Brian Orr, Michael Frost, Mark Payne, Angela Milce, Macquarie University, Sydney, Sydney, AUSTRALIA
Time-resolved optical double resonance spectroscopy reveals unusual energy-transfer propensities and quasi-continuum effects in congested rovibrational manifolds of molecular acetylene. These are explained by a combination of intramolecular coupling and field-induced perturbations, both collisional and radiative.
 
 
QWD18 14:30 - 16:00
Electron Quantum on-off Switching in Mercury Triatomic Cluster, A.C. Cefalas, E. Sarantopoulou, National Hellenic Research Foundation, Athens, GREECE, A. Vourdas, University of Liverpool, Liverpool, UK
Electron quantum on-off switching, by modulating the energy separation of its symmetric and anti-symmetric electronic wavefunctions in excited electronic states of mercury triatomic clusters was observed.
 
QWD19 14:30 - 16:00
Coherent Excitation with a Train of Electron Pulses, L D. Noordam, A Guertler, FOM Institute AMOLF, Amsterdam, THE NETHERLANDS, F. Robicheaux, Auburn University, AL, USA
We discuss how in a collision process a train of electron pulses can control the final state distribution of the excited target atoms.
 
 
QWD20 14:30 - 16:00
Coherent Raman Scattering in the Presence of a dc Electric Field in Molecular Hydrogen, D. A. Akimov, A.M. Zheltikov, A.B. Fedotov, A.N. Naumov, A. A. Serdyuchenko, D.A. Sidorov-Biryukov, M.V. Lomonosov Moscow State University, Moscow, RUSSIA, V. N. Ochkin, S. N. Tskhai, Russian Academy of Sciences, Moscow, RUSSIA
Polarization properties of coherent Raman scattering in the presence of a dc electric field in moecular hydrogen are investigated. Experimental technique for measuring dc electric fields with polarization coherent Raman scattering is proposed and implemented.
 
QWD21 14:30 - 16:00
VUV Laser Spectroscopy of the O2 Schumann-Runge System Near the Dissociation Limit, K Waring, B. R. Lewis, S. T. Gibson, Kenneth Baldwin, Australian National University, Canberra, AUSTRALIA
High resolution VUV spectroscopy using laser four wave mixing has measured perturbations to rovibrational line positions, widths and strengths in the O2 Schumann-Runge band that reveal the presence of interactions with previously unobserved states.
 
 
QWD22 14:30 - 16:00
Stable Regenerative Laser Amplifier on Colored µm-Layer in LiF Crystal with Nanosecond Flash Lamp Pumping, V. Baryshnikov, T. Kolesnikova, Irkutsk State Univesity, Irkutsk, RUSSIA
Ultrashort laser pulses (<10 ps) was formed at regime of regenerative amplifications in LiF crystal on 10 µm-layer with superhigh concentration F2 color centers at pumping by nanosecond flashes of powerful Xe-lamp.
 
 
QWD23 14:30 - 16:00
Photoactive Arrays at High Levels of Optical Excitation: The Effects of Chromophore Geometry and Polarisibilty, Robert Jenkins, David Andrews, University of East Anglia, Norwich, UK
In photoactive arrays at high levels of optical excitation, trichromophore mechanisms significantly contributed to energy pooling. The theory reveals a strong dependence on chromophore orientation, disposition, and polarisibility.
 
QWD24 14:30 - 16:00
Stochastic Resonance and Instabilities in a Magneto-Optical Trap, D. Wilkowski, Universite de Lille 1, Villeneuve d'Ascq, FRANCE, J. Ringot, J.C. Garreau, Laboratoire de Physique des Lasers, D'Ascq,, FRANCE, Daniel Hennequin, Universite de Lille 1, Villeneuve d'Ascq, FRANCE
Spatio-temporal instabilities of the atomic cloud of a magneto-optical trap are experimentally studied, and interpreted through a simple model. It is shown that instabilities are induced by a stochastic resonance like phenomenon.
 
 
QWD25 14:30 - 16:00
Magnetic Bistability of a Single Atom, H. Schadwinkel, V. Gomer, Dieter Meschede, Bonn University, Bonn, GERMANY
A single trapped cesium atom subject to a linearly polarized light field shows strong cross correlations of orthogonal circular polarization states in its resonance fluorescence. This observation can be interpreted as spontaneous and bistable magnetization.
 
 
QWD26 14:30 - 16:00
Large Angle Guiding of Atomic Beams by Magnetized Video Tape, Habib Merimeche, R. Bertram, D. Haubrich, M. Muetzel, Institut fuer Angewandte Physik, Bonn, GERMANY, P. Rosenbusch, Ed A. Hinds, University of Sussex at Brighton, Brighton, UK, Dieter Meschede, Bonn University, Bonn, GERMANY
We investigate reflectivity properties of magnetic mirrors based on sinusoidally magnetized video tape. The strong magnetic field gradients allow for guiding a slow atomic beam on curved trajectories with very small radii of curvature.
 
 
QWD27 14:30 - 16:00
Preparation of Single-Velocity Atoms for Matter-Wave Interferometry, Tomas Binnewies, U. Sterr, GERMANY, J. Helmcke, F. Riehle, Physikalisch-Technische Bundesanstalt, Braunschweig, GERMANY
"Maxwell's-demon cooling" based on the repeated selection and accumulation of the coldest atoms and rethermalization of the remaining hot atoms (T ª 3 mK) gave a one-dimensional cold ensemble. It was used to generate atom interferences with increased contrast.
 
 
QWD28 14:30 - 16:00
Atom Optics with Microfabricated Optical Elements, F.J.B. Buckremer, R. Dumke, Gerhard Birkl, Wolfgang Ertmer, Universitaet Hannover, Hannover, GERMANY
An important future direction in atom optics and atom interferometry will emerge from the development of miniaturized and integrated atom optical systems and atom sources. We propose several configurations based on microoptical elements.
 
 
QWD29 14:30 - 16:00
Evaporative Cooling of Metastable Helium Atoms, Paul Tol, Norbert Herschbach, Wim Hogervorst, Wim Vassen, Vrije Universiteit, Amsterdam, THE NETHERLANDS
A magnetostatic trap with ~108 Triplet helium atoms is demostrated, as well as the first results of evaporative cooling, the last stage before Bose-Einstein condensation.
 
 
QWD30 14:30 - 16:00
Penning Collisions in a Cold Gas of Trapped Metastable Helium Atoms, Jeremie Leonard, Francisco Perales, Franck Pereira Dos Santos, Alice Sinatra, Junmin Wang, Michele Leduc, Claude Cohen-Tannoudji, Ecole Normale Superieure, Paris, FRANCE
We measure the fluorescence decay of a magneto-optical trap of 5 108 Helium metastable atoms for several laser detunings and deduce the density rate ß for Penning ionizing collisions.
 
 
QWD31 14:30 - 16:00
Towards Bose-Einstein Condensation with Metastable Helium Atoms, D. Boiron, S. Nowak, A. Browaeys, J. Poupard, A. Robert, A. Westbrook, A. Aspect, Institut d'Optique, ORSAY, FRANCE
Metastable helium atoms were loaded into a magnetic trap resulting in samples of 108 Atoms at temperatures of 1mK. The measured life-time in the trap is 53s.
 
QWD32 14:30 - 16:00
Characteristic States of Atom Lasers via Maximally Robust Unravelings, John Vaccaro, University of Hertfordshire, Hatfield, Herts, UK, H.M. Wiseman, Griffith University, Brisbane, QLD, AUSTRALIA
We show that the atomic field of an atom laser is best characterized as being in amplitude-squeezed states. We derive scaling laws for these states and examine parameter regimes corresponding to recent experimental work.
 
 
QWD33 14:30 - 16:00
Creation of Skyrmions in a Spinor Bose-Einstein Condensate, Karl-Peter Marzlin, Universitaet Konstanz, Konstanz, GERMANY, Weiping Zhang, Barry Sanders, Macquarie University, Sydney, AUSTRALIA
We propose a scheme for the creation of skyrmions (coreless vortices) in a Bose-Einstein condensate. The corresponding optical potential is based on Raman transitions with an anomalous dependence on the laser polarization.
 
 
QWD34 14:30 - 16:00
Fermionic Lithium Atoms in a Resonator Dipole Trap, S. Jochim, Th. Elsaesser, Allard Mosk, M. Weidemueller, R. Grimm, Max-Planck Institute, Heidelberg, GERMANY
We present an optical trap fermionic lithium atoms, which is formed by the standing wave inside an optical resonator. It is ideally suited to study collision between ultracold fermions.
 
 
QWD35 14:30 - 16:00
Photoionization for Na and Li Cold Atoms in a MOT, V. Wippel, C. Binder, W. Huber, L. Windholz, Tech University of Graz, Graz, AUSTRIA, F. Fuso, Maria Allegrini, Ennio Arimondo, Universita di Pisa, Pisa, ITALY
Cold sodium and lithium atoms in magneto optical traps have been photoionized from the excited state using ultraviolet lines from an argon ion laser. The measured photoionization cross sections are compared to previous theoretical and experimental results.
 
 
 
QWD36 14:30 - 16:00
Topological Eigenfunctions of A Trapped Cold Ion, Colin Baxter, University of Strathclyde, Glasgow, Scotland, UK, Rodney Loudon, University of Essex, England, UK
An ion moving in a constant magnetic field and an external trapping potential is considered as the generic example of two-dimenisonal topological theory. For negligible kinetic energies, the ion's eigenfunction is consistent with a half-integral angular momentum spectrum.
 
 
QWD37 14:30 - 16:00
Using Talbot Lattices for Quantum State Manipulation, Hema Ramachandran, Raman Research Institute, Bangalore, INDIA, Harald Ellmann, Johan Jersblad, Anders Kastberg, University of Stockholm, Stockholm, SWEDEN
We suggest a method for doing quantum state manipulation with two interleaved Talbot optical lattices with the same spatial period.
 
QWD38 14:30 - 16:00
Toward Near-Field Optical Manipulation of Atoms Using a Nanometric Fiber Probe, Haruhiko Ito, Akifumi Takamizawa, Hideaki Tanioka, Tokyo Institute of Technology, Yokohama, Kanagawa, JAPAN, Hiroki Totsuka, ERATO, JST, Tokyo, JAPAN, Motoichi Ohtsu, Tokyo Institute of Technology, Yokohama, Kanagawa, JAPAN
We present measurement of near-field light intensity distribution produced by a nanometric fiber probe for precise control of atoms. Experimental progress of a near-field optical funnel to create a cold atomic beam is also reported.
 
 
QWD39 14:30 - 16:00
Towards a 2D Degenerate Quantum Gas, H. Perrin, B. Mercier, Universite Paris 13, Villetaneuse, FRANCE, M. Gorlicki, Martial Ducloy, J.-C. Keller, Vincent Lorent, Universite Paris-Nord, Villetaneuse, FRANCE
The creation of a 2D quantum degenerate gas of bosonic atoms is considered. Two guided modes of a slab dielectric waveguide produce a far off-resonance dipole trap and a loading mechanism for Rb87 atom.
 
 
QWD40 14:30 - 16:00
Cold Atoms Diagnostics by Non-Linear Spectroscopy, T Palasz, T Brzozowski, W Chalupczak, J Zachorowski, W. Gawlik, Institut Fizyki, Krakow, POLAND, Mjichal Zawada, Jagiiellonian University, Krakow, POLAND
Two techniques of non-linear spectroscopy of cold atoms in a MOT are experimentally compared: absorption and four-wave-mixing. The latter seems more useful for determination of the local field intensity and oscillations in an optical lattice.
 
 
QWD41 14:30 - 16:00
Bound Mode of an Atom Laser, John Jeffers, Peter Horak, Stephen Barnett, Colin Baxter, University of Strathclyde, Glasgow, Scotland, UK, Paul Radmore, University College London, London, UK
We find the eigenmodes of an atom laser, consisting of a single-mode cavity coupled to the continuum of free-space modes. The system exhibits a single, stationary bound mode, whose properties affect the laser output.
 
 
QWD42 14:30 - 16:00
Vortex Excitations in Binary Mixture of Trapped Bose-Einstein Condensates, Dmitry Skryabin, University of Strathclyde, Glasgow, Scotland, UK
Two distinct instablities originating from resonances of the elementary excitations of the vortices in a binary mixture of Bose-Einstein condensates have been found. One leads to the vortex drift out of the condensate. Second is the splitting of the higher order vortices into unit ones. Stabilizing role played by the vortex free component of the condensate is discussed.
 
QWD43 14:30 - 16:00
Laser Induced Selective Absorption of Neutral Atoms, M. Chevrollier, E. G. de Lima, H. N. de Froitas, P. C. Segundo, O. Di Lorenzo, Marcos Oria, UFPB, Joao Pessoa PB, BRAZIL
We propose to selectively load neutral atoms into a specific bound state of a surface well, by using a laser-induced Raman process.
 
 
QWD44 14:30 - 16:00
Atom Trapping Using Superimposed Bessel Beams, S. B. Cavalcanti, Universidad Federal de Alagoas, Maceio-AL, BRAZIL, S. Chavez-Cerda, INAOE, Puebla, Puebla, MEXICO, J. M. Hickmann, Universidad Federal de Alagoas, Maceio-AL, BRAZIL
A new and simple method to generate a light trap is proposed based on the interference pattern of Bessel beams which, under particular circumstances, is shown to produce a dark spot with a controllable size.
 
 
QWD45 14:30 - 16:00
Damped Collective Excitations of Bose Condensates in Optical Cavities, Peter Horak, Markus Gangl, Helmut Ritsch, Institut fuer Theoretische Physik, Innsbruck, AUSTRIA
We study the interaction of Bose condensates with driven optical cavities. We calulate the ground state, the spectrum of collective excitations and their damping rates which arise from the time-delayed response of the cavity field to changes of the condensate wave function.
 
 
QWD46 14:30 - 16:00
The Quantum Driven Pendulum and Quantum Phase Space Tunneling, W.K. Hensinger, A.G. Truscott, B. Upcroft, M. Hug, H.M. Wiseman, N.R. Heckenberg, Halina Rubinsztein-Dunlop, University of Queensland, Brisbane, QLD, AUSTRALIA
The dynamics of the Quantum Driven Pendulum (cold atoms in an amplitude-modulated standing wave) show features which can be utilized to observe phase space tunneling.
 
 
QWD47 14:30 - 16:00
Nano-Lithography with Metastable Helium Atoms, S. J. H. Petra, L Feenstra, Wim Vassen, Wim Hogervorst, Vrije Universiteit, Amsterdam, THE NETHERLANDS
A beam of metastable helium atoms is used to locally damage an organic resist layer through a physical or optical mask. This technique allows, via an etching process, the fabrication of structures with features < 100nm.
 
 
QWD48 14:30 - 16:00
Single Light Mode Hollow Optical Fibers for Guiding Metastable Helium Atoms, R. G. Dall, M. D. Hoogerland, Kenneth Baldwin, S. J. Buckman, Australian National University, Canberra, ACT, AUSTRALIA
Single light mode hollow optical fibres have been developed to enhance guiding of metastable helium atoms using blue detuned laser light. A hollow light funnel has also generated from the end of the fibres.
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