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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 - TUESDAY POSTERS

12 - 14 September, Nice Acropolis, Nice, France

 

MONDAY

TUESDAY

WEDNESDAY

THURSDAY

FRIDAY

TUESDAY POSTERS WEDNESDAY POSTERS THURSDAY POSTERS

 

CLEO POSTERS
 
14:30 - 16:00
Session: Poster Session
Room: Rhodes
 
CTuK1 14:30 - 16:00
A Novel Design of Waveguide Adaptor for Low Loss Mode Conversion, Soon Ryong Park, Beom-hoan O., Inha University, Inchon, KOREA
We propose a novel designing principle for waveguide mode adaptor. The overlap integration of two modes for each differential structure change is defined as a single step loss and the concept of constant loss provides optimized conversion structure for any cases.
 
CTuK2 14:30 - 16:00
Powerful Neodymium Lasers with the Self-Phase-Conjugation, Tasoltan Basiev, General Physics Institute, Moscow, RUSSIA, Alexander Fedin, , Andrey Gavrilov, Andrey Ruliov, Sergey Smetanin, Svetlana Kyalbieva, Kovrov State Technological Academy, Kovrov, RUSSIA
The powerful neodymium laser with the self-phase-conjugation (SPC), self Q-switching and LiF:F2- passive Q-switching are demonstrated. It is shown, that the application of a LiF:F2- crystal as Q-switcher and SPC-mirror simultaneously, and also a Sagnac interferometer as end reflector of the cavity allows to increase efficiency and quality SPC-radiation.
 
CTuK3 14:30 - 16:00
Required Coupling Strength for Phase Locking of a Diode Laser Array in an External Semiconfocal Resonator, Konstantin Boucke, Reinhart Poprawe, Fraunhofer Institut fuer Lasertechnik, Aachen, GERMANY
The minimum coupling strength required for phase locking of a diode laser array in an external semiconfocal resonator is derived, with the individual eigenfrequency deviations of the single emitters being a crucial parameter.
 
 
CTuK4 14:30 - 16:00
Holographic Generation of Laser Beam with Phase Singularity, Yoko Miyamoto, JAPAN, Atsushi Wada, Takumi Ohtani, Mitsutoshi Masuda, Mitsuo Takeda, University of Electro-Communications, Tokyo, JAPAN
Holograpically generated laser beams with phase singularity are examined. Splitting of higher charge singularities, complications caused by diffraction rings, and effect of illumination beam curvature is discussed. Fabrication of reflection holograms is also reported.
 
CTuK5 14:30 - 16:00
Leak Loss Analysis of Slab-Type Waveguides Consisting of Two-Dimensional Photonic Crystal, Shin'ichi Abe, , Niclas Carlsson, Kiyoshi Asakawa, Femtosecond Technology Association, Tsukuba, JAPAN
We evaluate leak loss of a slab-type waveguide consisting of two-dimensional photonic crystal by introducing the concept of leaky terms outside the expanded light cone. We make clear the existence of low loss frequency area outside the general light cone
 
 
CTuK6 14:30 - 16:00
Transverse Modes and Excess Noise Factor in Optical Resonators with Misaligned Mirrors, Stefano Longhi, Politecnico di Milano, Milano, ITALY
General analytical expressions for transverse modes and excess-noise factors in resonators with misaligned mirrors are derived. Large enhancement of excess-noise is predicted near the plane-plane instability and interpreted as due to transient amplification of noise.
 
 
CTuK7 14:30 - 16:00
CO2 Laser with Stable-Unstable Cavity: Q-Switch Regime with Active Mirror, Alexis Kudryashov, IPLIT, Moscow, RUSSIA, Vadim Samarkin, Russian Academy of Sciences, Moscow, RUSSIA, Alexander Zabelin, Technolaser Ltd., Shatura, RUSSIA
The results of the use of two types of adaptive mirrors to generate quasi Q-switch pulses of the 1 - 3 kW CO2 laser radiation are presented. The excess of the output power in peak above the average level in CW regime was more than 2.5 times.
 
 
CTuK8 14:30 - 16:00
Increased Brightness in Pumping Schemes Using Diode Bars, Niklaus Wetter, IPEN/CNEN-SP, Sao Paulo/SP, BRAZIL
We introduced a simple correction mechanism for diode bar curvature, also called "smile", which is capable of increasing the diode's beam quality by more than 100%.
 
CTuK9 14:30 - 16:00
Anamorphic Beam Shaping of Totally Incoherent Light, Nir Davidson, Weizmann Institute of Science, Rehovot, ISRAEL, L. Khaykovich, Weizmann Institute of Science, Rehovot, ISRAEL, Erez Hasman, Technion-Israel Institute of Haifa, ISRAEL
Anamorphic beam shaping of totally incoherent light beams was demonstrated and applied for high resolution grating based spectrometers and for solar light concentration beyond the one dimensional thermodynamic limit.
 
 
CTuK10 14:30 - 16:00
Control of Ring Lasers by Means of Coupled Cavities, Haim Abitan, Ulrik Andersen, Torben Skettrup, Technical University of Denmark, Lyngby, DENMARK, Peter Tidemand-Lichtenberg, Preben Buchhave, Technical University of Denmark, Lyngby, DENMARK
Variable phase coupling to an external ring is used to control a unidirectional ring laser. The observed behavior of the coupled rings is explained theoretically.
 
CTuK11 14:30 - 16:00
The Arrays of Phase-Locked Lasers, Alexandr Glova, , E.A. Lebedev, A. Yu. Lysikov, S.B. Shchetnikov, TRINITI, Moscow , RUSSIA
Radiaton parameters of 2D-arrays of waveguide CO2-lasers synchronised by in-cavity spatial filter method and phase-locking regime in a system of two unidirectional ring wave-guide lasers with optical coupling via common output mirror are investigated.
 
 
CTuK12 14:30 - 16:00
Analysis of Singularities in Vector Optical Waves, O.V. Angelsky, R.M. Besaha, A.I. Mokhun, I.I. Mokhun, M.O. Sopin, Chernivtsy University, Chernivsty, UKRAINE, \Marat Soskin, National Academy of Sciences, Kiev-22, UKRAINE
\Interferometric technique has been proposed for detection of the birth and annihilation of points of disclinations and analysis of polarization singularities in vector fields. The relationship between the characteristics of the complete system of phase vortices the behavior of the azimuth of a linearly polarized electrical field at s-contour, and the polarization singularities, dislocations, is established. The obtained results are extended to the case of fields with quasi-uniform states of polarization.
 
 
CTuK13 14:30 - 16:00
Hybrid of Custom Resonator and Resonator with Cat Eye Reflector, Sergei Dimakov, Institute for Laser Physics, St. Petersburg, RUSSIA
A new hybrid resonator is offered which accumulates advantages of a custom resonator and a resonator with a cat-eye reflector. Properties and application area (wider compared to that of the prototypes) of this resonator are discussed.
 
 
CTuK14 14:30 - 16:00
1-to-N-way Phased Array Resonator with Phase Conjugate Mirror, R.M. Jenkins, Defense Evaluation & Research Agency, Malvern, Worcestershire, UK, J. Banerji, Physical Research Laboratory, Ahmedabad, INDIA, A.R. Davies, University of London, Egham, UK
We propose a 1-to-N-way phased array resonator which can provide high output powers in quasi-Gaussian form while keeping a low intracavity power density by means of a phase conjugate mirror.
 
 
CTuK15 14:30 - 16:00
Misalignment Effects in the Resonator of a Transverse RF Excited Ar-He-Xe Laser, S. A. Starostin, University of Twente, AE Enschede, THE NETHERLANDS, Y. B. Udalov, NCLR BV, Enschede, THE NETHERLANDS, P. J. M. Peters, W. J. Witteman, University of Twente, AE Enschede, THE NETHERLANDS, I. V. Kochetov, A.P. Napartovich, V.N. Troshchieva, Troitsk Inst for Innov & Fusion Research, Moscow, RUSSIA
A laser resonator with a large transverse gain and refractive index inhomogeneity is studied experimentally and theoretically. It is shown that the inhomogeneity decreases the laser sensitivity to misalignment effects and leads to an asymmetry in the field distribution.
 
CTuK16 14:30 - 16:00
Self diffraction of the Laser Intracavity Beams in the Active Rod, V.B. Tsvetkov, D.A. Nikolaev, Ivan Shcherbakov, Russian Academy of Sciences, Moscow, RUSSIA
Experimentally demonstrated the high efficiency of the diffraction of the intracavity emission of free-running Nd-laser, being brought about by the interference of the splitted intracavity beams in the active rod.
 
 
CTuK17 14:30 - 16:00
1053-nm Nd:YLF Laser Passively Mode-Locked with a Saturable Bragg Relector (SBR), Ulrich Roth, M. MacDonald, J.E. Balmer, University of Bern, Bern, SWITZERLAND, D Burns, Martin Dawson, E. Bente, Institute of Photonics, Glasgow, UK
We present a stable, diode laser-pumped, SBR mode-locked Nd:YLF laser operationg in TEM00 mode at 1053 nm. Pulse durations between ~80 ps and 4 ns are obtained using intracavity etalons. At the maximum pump power of the 3-W diode laser the 1053-nm ouput power is 570 mW,corresponding to an optical efficiency of 19%.
 
 
CTuK18 14:30 - 16:00
Compact Diode-Pumped Nd:YVO4 MOPA Laser with Intracavity Beam Steering, J. Bourderionnet, Arnaud Brignon,, Jean-Pierre Huignard, Jean Paul Pocholle, Thomson CSF LCR, Orsay, FRANCE
We demonstrate intracavity beam steering of a diode pumped Nd:YVO4 oscillator using a liquid crystal spatial light modulator in a confocal resonator setup. The deflected beam is then amplified by a compact, large field-of-view Nd:YVO4 gain medium.
 
 
CTuK19 14:30 - 16:00
Three Dimensional Optical Trapping Using Plural Optical Fibers, Kozo Taguchi, Masaru Tanaka, Yukiyoshi Takahashi, Kentaro Atsuta, Masahiro Ikeda, Fukuyama University, Hiroshima, JAPAN
Optical forces acting on a particle by the laser beams from plural optical fiber were theoretically analyzed for three dimensional optical fiber trapping. The computations verified that transverse optical forces played an important role in levitating a micro-sphere.
 
 
CTuK20 14:30 - 16:00
A Study of Optical Rotational Manipulation of an Elliptically Shaped Biological Object, Kozo Taguchi, Masaru Tanaka, Yukiyoshi Takahashi, Kentaro Atsuta, Masahiro Ikeda, Fukuyama University, Hiroshima, JAPAN
Optical force acting on an elliptically shaped biological object was theoretically analyzed with the use of a two-dimensional model in order to numerically obtain the magnitude of the applied torque and directed of rotation.
 
 
CTuK21 14:30 - 16:00
Multi-Photon Confocal Microscopy by Using a Femtosecond Cr:Forsterite Laser, Tze-Min Liu, Shi-Wei Chu, Chi-Kuang Sun, National Taiwan University, Taipei, TAIWAN, R.O.C., Ping-Chen Cheng, SUNY - Buffalo, Buffalo, NY, USA
Multi-photon confocal microscopy was performed by using a femtosecond Cr:forsterite laser. Taking advantage of its unique wavelength emitting at 1200-1250 nm, high penetration depth and excellent multi-photon luminescence can be easily observed in most bio-tissues and labeling dyes.
 
 
CTuK22 14:30 - 16:00
Phase-Drift Suppression in Heterodyne Detection and Its Application to Optical Coherent Tomography, Manabu Sato, Kazutaka Onodera, Masahiro Akiba, Naohiro Tanno, Yamagata Technopolis Foundation, Yamagata, JAPAN
Without optical and electronic feedback systems, we have theoretically and experimentally demonstrated phase-drift suppression method to enhance the stabilization of signal intensity in heterodyne detection. Further, we have shown the application to optical coherence tomography.
 
CTuK23 14:30 - 16:00
Optical Properties of Breast Tumors Determined by a Laser-Pulse Mammograph, Heidrun Wabnitz, Dirk Grosenick, Herbert Rinneberg, Physikalisch-Technische Bundesanstalt, Berlin, GERMANY, K. Thomas Moesta, Peter Schlag, Robert-Roessle-Klinik, Berlin, GERMANY
From time - domain optical mammograms simultaneously recorded at wavelengths 670 nm and 785 nm reduced scattering and absorption coefficients, total haemoglobin concentration and blood oxygen saturation of tumors and surrounding normal breast tissue were derived.
 
 
CTuK24 14:30 - 16:00
Compact System for Clinical Recordings of Laser-Induced Fluorescence Spectra, Claes Af Klinteberg, Markus Andreasson, Ola Sandstroem, Stefan Andersson-Engels, Sune Svanberg, Lund Institute of Technology, Lund, SWEDEN
A compact and clinically adapted fluorosensor, providing time-integrated and time-resolved fluorescence emission spectra using two excitation wavelengths, is described. Additionally, diffuse reflectance spectra can be recorded using a white light source.
 
CTuK25 14:30 - 16:00
Real-Time 2D Imaging in Turbid Media Using a Femtosecond Cr4+:Forsterite Laser, E. Abraham, E. Bordenave, N. Tsurumachi, G. Jonusauskas, J. Oberle, C. Rulliere, Universite Bordeaux 1, Talence, FRANCE
We describe a nonlinear optical correlator associated with a femtosecond Cr4+:Forsterite laser for imaging through scattering media. Real-time 2D images have been obtained up to an attenuation of 15 mean free path.
 
 
CTuK26 14:30 - 16:00
Optical Frequency Upconversion of Tunable Nanosecond Laser Radiation in Collagen, T. Theodossiou, K. Politopoulos, G. Rapti, D. Yova, National Technical University of Athens, Zografou, Athens, GREECE, E. Georgiou, Technological Educational Inst of Crete, Stavromenos, Heraklio, GREECE, V. Hovhannisyan, Yerevan Physics Institute, Yerevan, ARMENIA
Second and Third Harmonic Generation using tunable 760-1070nm nanosecond laser excitation is demonstrated in Type I collagen. The measured signal temporal and spectral widths and harmonic intensity dependencies are all consistent with the nonlinear-upconversion interpretation.
 
CTuK27 14:30 - 16:00
Near Field Optical Analysis of Bacteria Morphological Variations, E. Cefali, S. Patane, S. Guglielmino, S. Cappello, A. Pernice, Universita di Messina, Sant'Agata-Messina, ITALY, Maria Allegrini, Universita di Pisa, Pisa, ITALY
Near field optical microscopy has been used to follow the morphological and structural evolution of bacteria under nutrition and physical stress. Shape variety in the microbial population has been observed with submicron resolution.
 
 
CTuK28 14:30 - 16:00
Numerical Analysis for Single-Beam Fiber Optic Trap, Kozo Taguchi, Masaru Tanaka, Yukiyoshi Takahashi, Kentaro Atsuta, Masahiro Ikeda, Fukuyama University, Hiroshima, JAPAN
Optical forces acting on a sphere were experimentally and theoretically studied to corrobate the fiber trapping. From these investigations, we verified that a particle was trapped at the point where the -x-directed transverse force and +x-directed axial force are precisely balanced.
 
 
CTuK29 14:30 - 16:00
High Repetition Rate Femtosecond Lightsource for CARS Microscopy, Eric Potma, Wim de Boeij, Maxim Pshenichnikov, Douwe Wiersma, University of Groningen, Groningen, THE NETHERLANDS
We have constructed a high repetition rate multicolour tunable femtosecond lightsource based on a cavity-dumped visible optical parametric oscillator. The system is interfaced with a Coherent Anti-Strokes Raman microscope and allows spectrally selective probing for specific biochemical species.
 
CTuK30 14:30 - 16:00
Optical Near-Field Analysis of Biostructures in Aqueous Solutions: Problems and Proposals, J. Beuthan, C. Dressler, H.-G. Eberle, C. Labouvie, M. Paul, Freie Universitaet Berlin, Berlin, GERMANY
Scanning probe near-field optical microscopy of vital biological specimens is problematic concerning carrying out and interpretation. Therefore a modified optical near-field concept is proposed, which use a laser or electron beam excited 2D-array of nano light sources.
 
 
CTuK31 14:30 - 16:00
Ti:Sapphire Laser with a Cu-Vapour Laser Pump for Two-Photon Photodynamic Therapy, V.I. Baraulya, , Serguei Kobtsev, S.V. Kukarin, A.A. Pustovskih, V.B. Sorokin, Novosibirsk State University, Novosibirsk, RUSSIA
Reported are the results of development and study of a efficient ns Ti:Sapphire laser with a short (3-5 mm) Ti3+ (0.2-0.23%):Al2O3 crystals. Different efficiency of generation amounted to 30.4% (at 780 nm), the generation threshold being about 1 W, peak output power was 2.7 kW (at 8-ns FWHM pulse duration).
 
 
CTuK32 14:30 - 16:00
Special Hollow-Glass Waveguides for Medical Applications, Helena Jelinkova, Jan Sulc, Pavel Cerny, Michal Nemec, Miroslav Cech, Czech Technical University, Prague 1, CZECH REPUBLIC, Mitsunobu Miyagi, Tohoku University, Aramaki, Sendai-shi, JAPAN, Yi-Wei Shi, Yuji Matsuura, Tohoku University, Sendai, JAPAN
Special hollow glass waveguides were used for delivery of Nd and Er:YAG laser radiation. Maximum waveguide output intensity was 204 GW/cm2 for Nd:YAG and 1.3 MW/cm2 for Er:YAG radiation. Ophthalmology, dentistry and cardiology applications were investigated.
 
 
CTuK33 14:30 - 16:00
High Power Diode-Pumped Nd:Host Lasers Passively Q-Switched at 1.3µm, Antonio Agnesi, S. Dell'Acqua, E. Piccinini, A. Guandalini, G.C. Reali, Universita di Pavia, Pavia, ITALY, Jan Jabczynski, Krzysztof Kopczynski, Zygmunt Mierczyk, Military University of Technology, Warsaw, POLAND
We report multiwatt diode-pumped neodymium lasers passively Q-switched at 1.3-µm with V:YAG crystals. Saturable absorbers and cavity design were optimized for each particular laser crystal, for both high energy and high average power.
 
 
CTuK34 14:30 - 16:00
Investigation of the Power Limiting Factors for a Q-Switched 2.0µm-Tm:YAG-Laser, Michael Mond, A. Diening, Ernst Heumann, Guenter Huber, Universitaet Hamburg, Hamburg, GERMANY
We have correlated the crystal damage threshold of a Q-switched 2.0µm Tm:YAG-laser with the thermal load inside the crystal. Further resullts are based on a comparison between laser experiments and a simulation relying on a rate equation model.
 
 
CTuK35 14:30 - 16:00
Nonlineaer Mode Coupling in Er:Yb:Glass Microchip Lasers, Mehdi Alouini, F. Bretenaker, M. Brunel, A. Le Floch, M. Vallet, Universite de Rennes, Rennes, FRANCE, Ph. Thony, CEA Grenoble/LETI, Grenoble, FRANCE
The nonlinear mode coupling in Er:Yb:Glass microchip lasers is probed. The large values measured for the coupling constants between longitudinal modes or orthogonally polarised modes explain the condition for single frequency operation of such lasers.
 
 
CTuK36 14:30 - 16:00
Diode-Pumped Passively Q-Switched Yb:KGW laser with V:YAG Saturable Absorber, A.A. Lagatsky, A. Abdolvand, N.V. Kuleshov, Belarus State Polytechnical Academy, Minsk, BELARUS
The first realization of diode-pumped passively Q-switched Yb:KGW laser with V3+:YAG saturable absorber has been reported. Raman conversion of the fundamental laser emission in the Yb:KGW laser crystal has been demonstrated.
 
 
CTuK37 14:30 - 16:00
A Multi-Pass Rebuild of the HELEN High Power Laser at AWE, Michael Norman, J.E. Andrew, Tom Bett, R.K. Clifford, M.D. Dooley, J.E. England,, N.W. Hopps, H.A. McInnes, J.R. Nolan, K.W. Parker, K. Porter, S.D. Roberts, R.M. Stevenson, AWE plc, Reading, Berkshire, UK
We report on the recent conversion of the HELEN high power Nd:glass laser to a multi-passed configuration, maintaining or exceeding previous performance levels whilst reducing operation costs and increasing reliability by reductions in component count.
 
 
CTuK38 14:30 - 16:00
Measurement of the Excited State Absorption Cross-Section in Cr4+:YAG Using Relaxation Oscillations Study, S. Naumov, Irina Sorokina, Evgeni Sorokin, Technische Universitaet Wien, Wien, AUSTRIA
We present an alternative method for the excited state absorption cross-section measurement at the pump wavelength for the four-level laser system using the study of the relaxation oscillations of the Cr4+:AG laser.
 
 
CTuK39 14:30 - 16:00
Passive Q-Switching of 1.34-µm Neodymium Laser Using Co2+:LiGa5O8 and Co2+:MgAl2O4, K.V. Yumashev, I.A. Denisov, International Laser Center, Minsk, BELARUS, N.V. Kuleshov, Belarus State Polytechnical Academy, Minsk, BELARUS
The Q-switching of Nd3+:YAlO3 laser, operating at 1.34 µm, was demonstrated using Co2+:MgAl2O4 saturable absorder Q-switches. Q-switched pulses of 60 ns in duration and up to 20mJ in energy were obtained. The absorption cross sections and bleaching relaxtion times of the Co2+:LiGa5O8 and Co2+:MgAl2O4 crystals at 1.34µm and 1.54µm were measured.
 
 
CTuK40 14:30 - 16:00
Cr2+:Cd0.55Mn0.45Te Passive Q-Switcher for 2 µm-Lasers, Alexander Podlipensky, Belarus State Polytechnical Academy, Minsk, BELARUS, N.V. Kuleshov, Belarus State Polytechnical Academy, Minsk, BELARUS, V.I. Levchenko, V.N. Yakimovich, National Academy of Sciences of Belarus, Minsk, BELARUS, S. Girard, Richard Moncorge, Universite de Caen, Caen, FRANCE
Passive Q-switching of a flash-lamp pumped 2.09µm Ho,Tm,Cr:YAG laser has been demonstrated with a Cr2+:Cd0.55Mn0.45Te saturable absorber without intracavity focusing. A pulse duration of 200 ns and an output pulse energy of 8 mJ were obtained.
 
 
CTuK41 14:30 - 16:00
Energy Recycling Versus Lifetime Quenching in Erbium-Doped 3-µm Fiber Lasers, Markus Pollnau, Swiss Federal Institute of Technology, Lausanne, SWITZERLAND, P.S. Golding,, S.D. Jackson, T.A. King, University of Manchester, Manchester, UK
Spectroscopic and numerical investigations show that energy-transfer upconversion can efficiently recycle energy in 3-µm Er:ZBLAN fiber lasers at relatively low dopant concentrations, thereby dramatically increasing the slope efficiency compared to lifetime quenching by Pr3+.
 
 
CTuK42 14:30 - 16:00
Luminescence and Laser Action of Nd3+ Doped Double Chloride Crystal, S. Ivanova, St. Petersburg State University, St. Petersburg, RUSSIA, Alexandra Tkachuk, S.I. Vavilov State Optical Institute, St. Petersburg, RUSSIA, Ludmila Isaenko, A. Yelisseyev, Design and Technological Institute for Monocrystals, Novobirsk, RUSSIA, M. Nostrand, Ralph Page, Steve Payne, Lawrence Livermore National Laboratory, Livermore, CA, USA
The double chloride KPb2Cl5-Nd3+ crystals were grown, for the first time, the optical spectra were studied, intensity parameters, radiative and non-radiative transition probabilites were calculated, and concentration quenching was considered. We have demonstrated laser action at 1.06 µm achieving a slope efficiency of 7%, using pumping at 882 nm with a Cr:LiSAF laser.
 
 
CTuK43 14:30 - 16:00
Anomalous Absorption Saturation in Cr,MG:YAG and Cr,Ca:YAG, Irina Sorokina, S. Naumov, Evgeni Sorokin, Technische Universitaet Wien, Wien, AUSTRIA, W.Y. Ching, Y.-N. Xu, University of Missouri-Kansas City, Kansas City, MO, USA, B.K. Brickeen, Honeywell Inc., Kansas City, MO, USA
We report on the results of experimental and theoretical investigation of the photoinduced anomalous absorption saturation in concentrated Cr:YAG and propose the physical mechanism, which can be responsible for the effect.
 
 
CTuK44 14:30 - 16:00
Multi-Stripe Tunable Waveguide DFB Laser for New Type of Laser Spectroscopy, Mitsuo Maeda, Yuji Oki, Takeshi Yoshiura, Yuichi Chisaki, Kyushu University, Fukuoka, JAPAN
A solid-state tunable dye laser with muti-stripe PMMA waveguide was fabricated. When all stripes were simultaneuously pumped by a pulsed Nd:YAG laser, this device showed DFB laser action with very low threshold of 400nJ/stripe. A new type of very-fast-scan laser spectroscopy is possible using this device.
 
 
CTuK45 14:30 - 16:00
High-Power Solid-State Dye Lasers Pumped by a Copper Vapour Laser at 1kHz, D.W. Coutts, University of Oxford, Oxford, UK, Colin Webb, Clarendon Lab, Oxford, UK, A. Costela, I. Garcia-Moreno, Instituto Rocasolano, Madrid, SPAIN, R. Sastre, Inst de Ciencia & Tecnologia de Polimeros, Madrid, SPAIN
A solid state dye laser (PIR 567 in PMMA:PETA 95.5) operating at 1 kHz pulse repetition frequency produced 290 m W output power with 37% efficiency and a lifetime of over one hour.
 
 
CTuK46 14:30 - 16:00
Excitation of the Thulium 1G4 Level, Melchior Kehrli, Chr. P. Wyss, T. Huber, P.J. Morris, Willy Luethy, Heinz Weber, University of Bern, Bern, SWITZERLAND, Yu.D. Zavartsev, Russian Academy of Sciences, Moscow, RUSSIA
Thulium-doped crystals and glasses are promising candidates to realise an IR-pumped blue upconversion laser. We study excitation schemes that can be realised with existing powerful laser diodes. It is shown that co-doping with Ytterbium is required.
 
 
CTuK47 14:30 - 16:00
Tunable Dual Frequency Tm:YAG-Laser, G. Quehl, J. Gruenert, A. Hemmerich, Universitaet Hamburg, Hamburg, GERMANY
We demonstrate a miniature single transverse mode Thulium:YAG laser with 11% slope efficiency, 200mW threshold and a tuning range from 1940nm to 2030nm. It's dual frequency operation and small linewidth are appreciated in spectroscopy.
 
CTuK48 14:30 - 16:00
Tunable, V^3+:YAG Q-Switched, Cr:LiCAF Laser, Jan Jabczynski, Military University of Technology, Warsaw, POLAND, J. Janucki, Waldemar Zendzian, Zygmunt Mierczyk, D, Z. Frukacz, Military University of Technology, Warsaw, POLAND
Flash-lamp pumped Cr:LiCAF laser, passively Q-switched by means of V3+:YAG, tunable in a range of 760-805 nm was demonstrated. Above 1 mJ of pulse energy with 50 ns pulse duration was achieved.
 
 
CTuK49 14:30 - 16:00
Output Fluctuations of Intracavity Doubled Lasers with Type I and Type II Phase Matching, Christoph Czeranowsky, V.M. Baev, Guenter Huber, Universitaet Hamburg, Hamburg, GERMANY, P.A. Khandokhin, Y. Khanin, I. Koryukin, E. Yu. Shirokov, Russian Academy of Sciences, Nihny Novgorod, RUSSIA
An experimental and theoretical study of the low frequency dynamics of a bipolarised Nd:YAG laser intracavity doubled by KTP crystal (type II phase matching) or LiB3O5 (type I phase matching) respectively are reported.
 
 
CTuK50 14:30 - 16:00
Spectroscopic Study of Na0.4Y0.6F2.2:Nd3+ Crystals, S. Ivanova, St. Petersburg State University, St. Petersburg, RUSSIA, Alexandra Tkachuk, S.I. Vavilov State Optical Institute, St. Petersburg, RUSSIA, M.-F. Joubert, Y. Guyot, S. Guy, Universite Lyon 1, Villeurbanne, FRANCE
The optical spectra of Na0.4Y0.6F2.2:Nd3+ crystals were studied parameters were determined by the Judd-Ofelt method. The probabilities of radiative transitions were calculated, multiphoton relaxation rates were estimated, and concentration dependencies of quenching rates of luminescence from 4F3/2, 2P3/2, and 4D3/2 levels were studied. Possible upconversion pump scheme are considered.
 
 
CTuK51 14:30 - 16:00
Actively Mode-Locked and Diode-Pumped Nd3+:LBGM Laser, O. Chekhlov,, A.A. Demidovich, A.N. Kuzmin, G.I. Raybtsev, National Academy of Sciences of Belarus, Minsk, BELARUS, A.N. Titov, Russian Academy of Sciences, St. Petersburg, RUSSIA
Active mode-locking of end-pumped Nd:LBGM (Li3Ba2Gd3(MoO4)8:Nd3+) laser has been investigated. Oscillation of a limited train ~3,3 ps pulses was achieved in presence of hole buring in the active medium. Double wavelength pulses with a sin2 temporal function were also generated.
 
 
CTuK52 14:30 - 16:00
Tunable and Mode-Locking Operation of a Diode-Pumped Nd:Ca3(GaNb)2-xGa3)12 Laser, Antonio Agnesi,, S. Dell'Acqua, A. Guandalini, G.C. Reali, Universita di Pavia, Pavia, ITALY, F. Cornacchia, A. Toncelli, M. Tonelli, Universita di Pisa, Pisa, ITALY, Kiyoshi Shimamura, Tsuguo Fukuda, Tohoku University, Sendai, JAPAN
We report new spectroscopic results on the disordered garnet laser crystal Nd:Ca3(GaNb)2Ga3. We also demonstrated 21-nm tunability near l=1060 nm and the generation of sub-20-ps pulses by active modelocking.
 
 
CTuK53 14:30 - 16:00
UV Beam Sources for Double Pulse Generation, Stephan Falter, Keming Du, Peter Loosen, Reinhart Poprawe, Fraunhofer Institut fuer Lasertechnik, Aachen, GERMANY, O. Baldus, R. Waser, FZI Research Center Juelich, Juelich, GERMANY
A system consisting of two efficient UV Nd:YAG-lasers with beam coupling has been realized to generate double-pulses with variable nanosecond separation allowing detailed material processing depending critically on the pulse-length.
 
 
CTuK54 14:30 - 16:00
Diode Pumped LiLa1-xNdx(MoO4)2 and Nd:Bi4Ge3O12 Lasers, V.A. Mikhailov, A.I. Zagumennyi, Yu.D. Zavartsev, V.A. Kondratyuk, P.A. Studenikin, Ivan Shcherbakov, Russian Academy of Sciences, Moscow, RUSSIA, Young-nam Jang, Soo-chon Chae, In-kook Bae, Korea Inst of Geology, Mining & Materials, Taejon, KOREA
The main lasing parameters of diode pumped microchip laser based on Nd:Bi4Ge3O12 and LiLa1-xNdx(MoO4)2 crystals with Nd3+ concentration 2 -5 at.% were studied. Laser efficiency at 1.06 µm and 0.53µm was up to 44 % and 12 % respectively. Thermally induced lens and its astigmatism were measured.
 
 
CTuK55 14:30 - 16:00
Microchip Lasers Based on Nd:Ca4GdO(BO3)3, G. Lucas-Leclin, Francois Balembois, Patrick Georges, Alain Brun, Institut d'Optique, Orsay, FRANCE, F. Mougel, Gerard Aka, FRANCE, D. Vivien, ENSCP, Paris, FRANCE, J. Marty, B. Ferrand, J.M. Maillart, CEA Grenoble/LETI, Grenoble, FRANCE, D. Pelenc, Crismatec, Nemours , FRANCE
We investigated performances of Nd:GdCOB microchip lasers under Ti:sapphire-pumping and diode-pumping. We obtained up to 140 mW at 1060 nm with a pump diode emitting 2W at 812 nm.
 
 
CTuK56 14:30 - 16:00
Population of Excited Levels in YLF:Er Crystals Under CW Laser Diode Pumping, I.K. Razumova, Alexandra Tkachuk, S.I. Vavilov State Optical Institute, St. Petersburg, RUSSIA, A.A. Mirzaeva, Russian Academy of Sciences, St. Petersburg, RUSSIA, Valentin Gapontsev, IPG Laser GmbH, Burbach, GERMANY
An influence of interionic cross relaxation processes (upconversion, selfquenching) on concentration deoendencies of the inverse population of laser levels in YLF: Er crystals under CW laser-diode pumping were studied, both theoretically and experimentally. Computer simulations were carried out taking into account not only pair interaction but also the multi-ion interaction in all systems. Optimal Er concentration for 3 - µm CW lasing was estimated as 10 - 15 %
 
 
CTuK57 14:30 - 16:00
42 ps Pulses from a Flashlamp Pumped Nd:YAG Laser Using All-Solid-State Passive Pulse Control, Jens Biegert, Jean-Claude Diels, K.J. Malloy, A. Stinz, University of New Mexico, Albuquerque, NM, USA, Vaclav Kubecek, Czech Technical University, Prague, CZECH REPUBLIC
We report on a new all-solid-state source of trains and single high power picosecond pulses with accurate shot to shot reproducibility, based on a simple flashlamp pumped actively-passively mode-locked Nd:YAG laser with passive negative feedback and quantum well saturable absorber.
 
 
CTuK58 14:30 - 16:00
First-Principle Calculation of Peak Energy and Intensity of Absorption Spectra in Cr4+-Doped System, Takugo Ishii, Koji Fujimura, Kazuyoshi Ogasawara, Isao Tanaka, Hirohiko Adachi, Kyoto University, Kyoto, JAPAN
Peak positions and dipole transition probabilities of optical absorption spectra in Cr4+-doped system, such as Cr4+:Ca2MgSiO7 (akermanite), were calculated by a first-principle method for many-electron system which we have recently developed.
 
 
CTuK59 14:30 - 16:00
Investigation of Green and Red Up-Converted Luminescence in Ho3+ Doped LiYF4, S. Kueck, Irena Sokolska, M. Henke, Universitat Hamburg, Hamburg, GERMANY
Up-conversion processes were investigated at room temperature after the excitation into the 5I4 or 5I5 mutlipletsof Ho3+ in LiYF4. Both excitation energies lead to green and red emission from the 5S2 and the 5F5 multiplet, repectively, with different mechanisms of up-conversion.
 
 
CTuK60 14:30 - 16:00
Investigation of Cr4+-Ion Doped Passive Q-Switches, Marek Skorczakowski,, Z. Jankiewicz, J. Swiderski, Andrzej Zajac, W. Endzian, Military University of Technology, Warsaw, POLAND
The results of the examinations of Cr4+-ion doped crystalline saturable absorbers at 1.06 µm including lasing characteristics and the properties of the Q-swiches are presented. The detailed analysis of passively Q-switched lasers based on the normalized dimensionless
rate equations taking into account excited state absorption and lifetimes of the saturable absorber as well as the magnification in the laser cavity is developed.
 
 
CTuK61 14:30 - 16:00
Q-Switched Pulses in the us Time Regime by Means of a Diode Pumped Frequency Doubled Nd:YLF Laser, Dietmar Kracht, R. Brinkmann, Medical Laser Center Luebeck GmbH, Luebeck, GERMANY
A transversally diode pumped Nd:YLF laser with intracavity second harmonic generation is used to generate pulses with adjustable duration in the µs time regime. Pulse energies of up to several millijoules at a repetition rate of 500Hz were achieved.
 
 
CTuK62 14:30 - 16:00
Threshold Analysis of Waveguide Circular Grating-Coupled Surface-Emitting Lasers with Integrated Focusing Outcoupler, Tomasz Kossek, Warsaw University of Technology, Warsaw, POLAND, Pawel Szczepanski, National Institute of Telecommunications, Warsaw, POLAND
In this paper, we present the systematic numerical studies of the influence of the integrated focusing outcoupler on the threshold characteristics. In our model the effect of the outcoupler is described by complex reflectivity.
 
 
CTuK63 14:30 - 16:00
Modelling of Generation Dynamics of Actively and Passively Q-Switched Microchip Lasers, A.S. Dement'ev, Institute of Physics, Vilnius, LITHUANIA, R. Navakas, Vytautas Magnus University, Kaunas, LITHUANIA
An advanced point laser model and simulation results of a solid-state microlasers with passive, active and combined Q-switching are presented. A number of physical effects that are usually neglected in such models are included. Simulation results are in good agreement with known experimental data.
 
 
CTuK64 14:30 - 16:00
Polarization Insensitive Detection of Optical Phase Modulation by Means of Adaptive Photo-EMF Detectors, M.A. Celis Flores, S. Stepanov, P. Rodriguez Montero, INAOE, Puebla, Pue., MEXICO
Polarization insensitive detection of optical phase modulation by adaptive photodetectors is proposed and experimentally demonstrated in two-detector and single-detector configurations. GaAs photo-EMF detectors utilized allow us to suppress polarization fluctuations with frequencies up to several kHz.
 
 
CTuK65 14:30 - 16:00
Stationary Theory of Phase Conjugation by SBS Amplification in Cylindrical Fibers, Andrei Fotiadi, Russian Academy of Sciences, St. Petersburg, RUSSIA
A stationary theory of phase conjugation by SBS amplification in a multimode cylindrical fiber has been developed. It takes into account specific features of light propagation in fibers and hypersound diffraction effects. The theory is in excellent agreement with experiment.
 
 
CTuK66 14:30 - 16:00
Photorefraction and Thermal Fixing in Channel Waveguides Fabricated in Lithium Niobate by Titanium and Copper Indiffusion, J. Hukriede, Detlef Kip, Eckhard Kraetzig, Universitaet Osnabrueck, Osnabrueck, GERMANY
The photorefractive properties of monomode channel waveguides for 1550 nm fabricated lithium niobate additionally doped with copper are investigated. High temperature recording with green light yields fixed holograms without the need of any development process.
 
 
CTuK67 14:30 - 16:00
Vectorial Phase Conjugation by Degenerate Four-Wave-Mixing in a Saturable Amplifier Polymer Laser Dye, Tomohiro Hirose, Takashige Omatsu, Mitsuhiro Tateda, Chiba University, Chiba, JAPAN
We present the first report to the best of our knowledge of vectorial phase conjugator in a laser-pumped polymer laser dye. The average VPC fidelity of 0.95 with the maximum reflectivity of 16% is obtained.
 
 
CTuK68 14:30 - 16:00
Isotropic and Anisotropic Spiraling Photorefractive Solitons, Andreas Stepken, F. Kaiser, Darmstadt University of Technology, Darmstadt, GERMANY, M.R. Belic, Institute of Physics, Belgrade, YUGOSLAVIA
The spiraling behavior of photorefractive solitons is studied numerically. Initially, isotropic and anisotropic solitons rotate about each other. However, we show that prolonged spiraling is not possible, because angular momentum is not conserved.
 
 
CTuK69 14:30 - 16:00
Spectra of Space Charge Waves in Photorefractive Crystals, M.P. Petrov, V.V. Bryksin, V.M. Petrov, Russian Academy of Sciences, St. Petersburg, RUSSIA, S. Wevering, E. Kratzig, Universitaet Osnabrueck, Osnabrueck, GERMANY
Spectra of space charge waves at the linear and nonlinear recording regimes were studied. Precision measurements of their dispersion law were performed. A theory of linear and nonlinear excitation of space charge waves was developed.
 
 
CTuK70 14:30 - 16:00
White-Light One-Way Image Transmission Through a Thick Dynamic Distorter, Jiasen Zhang, Shin Yoshikado, Tadashi Aruga, Communications Research Lab, Koganei-shi, Tokyo, JAPAN
We demonstrated white-light one-way image transmission through a thick dynamic distorter. In the method a high-resolution photorefractive incoherent-to-coherent optical converter was used. Reconstructed images with high fidelity have been obtained.
 
 
CTuK71 14:30 - 16:00
Investigation of Temporal and Spatial Charge Dynamics by Wave Mixing Techniques, K. Jarasiunas, M. Sudzius, R. Aleksiejunas, V. Gudelis, L. Bastiene, Vilnius University, Vilnius, LITHUANIA
Free carrier and photorefractive optical nonlinearities have been invertigated in GaAs and CdTe:Ge crystals by four-wave mixing techniques. The performed experimental and numerical studies give deeper insight into charge transport phenomenon in photorefractive crystals.
 
CTuK72 14:30 - 16:00
Thermal Fixing of Holograms and Their Electrical Development in Barium-Calcium-Titanate Crystals, N. Korneev, INAOE, Puebla, Pue., MEXICO, H. Veenhuis, Karsten Buse, Eckhard Kraetzig, Universitaet Osnabrueck, Osnabrück, GERMANY
Fixing grating in barium calcium titanate is investigated below and above phase transition with photoelectromotive force technique. The diffraction efficiency of fixed grating can be strongly enhanced by applying the electric field at reconstruction stage.
 
 
CTuK73 14:30 - 16:00
High-Quality, Low-Power Optical Phase Conjugation in Films of an Azo-Containing Side-Chain Liquid Crystal Polymer, Andrey Larichev, A.N. Simonov, Moscow State University, Moscow, RUSSIA
We have demonstrated low-power, high-quality phase conjugation in the films of azocontaining side-chain LC polymer. The influence of experimental conditons on the performance of the system was studied experimentally.
 
 
CTuK74 14:30 - 16:00
Photorefractive Trapping and the Correlation Between Recording and Erasure Dynamics in a Polymer Composite, K. Khand, D.J. Binks, Dave West, M.D. Rahn, University of Manchester, Manchester, UK
Experimental evidence is presented which demonstrates that the processes of charge photogeneration and optical de-trapping in photorefractive polymers are strongly correlated across a wide range of experimental conditions. The sensitisor leads to charge trapping.
 
 
CTuK75 14:30 - 16:00
Use of the SBS Mirror in Excimer Laser Cavity, V.F. Losev, Yu.N. Panchenko, Russian Academy of Sciences, Tomsk, RUSSIA
The results of an experimental investigations of XeCl laser with a resonator formed by output mirror and an SBS medium are reported. Conditions of stimulated Brillouin scattering near threshold are used, formation of high quality laser beam is discussed.
 
 
CTuK76 14:30 - 16:00
Investigation of the Operation of Adaptive Loop Resonator Under Different Magnitude of the Optical Phase Distortions of the Intracavity Beams, V.B. Tsvetkov, G.A. Bufetova, D.A. Nikolaev, Ivan Shcherbakov, Russian Academy of Sciences, Moscow, RUSSIA
Degree of the compensation of specially introduced intracavity wave front distortions by the adaptive loop resonator was investigated. The high efficiency of the intracavity four-wave mixing in Cr-doped Q-switch was demonstrated in beam quality improvement.
 
 
CTuK77 14:30 - 16:00
Optimization of Multiplexing Scheme in Photorefractive Disk-Type Memory, Masatoshi Bunsen, Atsushi Okamoto, Hokkaido University, Sapporo, JAPAN, Kunihiro Sato, Hokkai-Gakuen University, JAPAN
We propose the optimization method for the exposure time in the shift-multiplexed photorefractive disk-type memory. By this optimization, the degree of multiplexing would be significantly improved and contribute to the enhancement of the storage density.
 
 
CTuK78 14:30 - 16:00
Topography of the Ferroelectric Micro Domains at the C-Faces of a BaTiO3:Rh Crystal, Pierre Mathey, Pierre Lompré, Pierre Jullien, Universite de Bourgogne, Dijon Cedex, FRANCE, Daniel Rytz, Forschungsinstitut Idar-Oberstein, Idar-Oberstein, GERMANY
Anitparallel ferroelectric micro domains are detected and analysed with a profilometer. Their shape is squared with rounded corners. At one c-face, they appear as being humps while at the opposite face, they are hollows.
 
 
CTuK79 14:30 - 16:00
Optical Recording of Phase Holographic Gratings in a Jelly-Like Dye Doped Gelatin, T. Sh. Efendiev, V.M. Katarkevich, A.N. Rubinov, National Academy of Sciences of Belarus, Minsk, BELARUS
Results of experiments on the recording of phase 3-dimentional gratings in a new light-sensitive material - a jelly-like dye-doped gelatin are presented. Such medium allows without use of dichromate of ammonium to record stationary phase holograms with spatial resolution ª5000 1/mm, diffraction efficiency of some percents and angular selectivity ~ 15'.
 
 
CTuK80 14:30 - 16:00
Application of the Z-Scan Techinque to a Saturable Photorefractive Medium, Yu Barmenkov, Alexander Kir'yanov, Maria Del Rayo, A.N. Starodumov, Centre de Investigaciones en Optica, Leon, GTO, MEXICO, N. V. Tkachenko, H. Lemmetyinen, University of Technology, Tampere, FINLAND.
Z-scan technique is applied to saturable medium described by a generalized three-level scheme of photoexcitation. Correctness of the Z-scan data interpretation is analyzed in framework of the model. The approach is applied for measuring the refractive indices Dn and n2 in polymer films containing Bacteriorhodopsin and Langmuir-Blodgett films of porphyrin.
 
 
CTuK81 14:30 - 16:00
Influence of Current Ansiotropy on Self-Focusing in Photorefractive Crystals, N. Korneev, INAOE, Puebla, MEXICO
We investigate numerically the influence of existing in ferroelectric photorefractives current anisotropy on circular beam self-focusing in these materials. The output beam ellipticity is less pronounced in strontium barium niobate than in barium titanate.
 
CTuK82 14:30 - 16:00
Photorefraction in Iron-Doped Sn2P2S6, A. Shumelyuk, S.G. Odoulov, Institute of Physics, Kiev, UKRAINE, A. Ruediger, O. Schirmer, Universitaet Osnabrueck, Osnabrueck, GERMANY, A. Grabar, I. Stoyka, Institute of Solid State Physics & Chem, Uzhgorod, UKRAINE
We investigate the photorefractive, optical and EPR properties of the iron doped tin hypothiodiphosphate crystal. Properties of Fe-doped and nominally pure samples are compared.
 
 
ROOM: Mediterranee
Session: CLEO/ EUROPE Poster Session
 
 
CTuK83 14:30 - 16:00
Ultrafast Optically Induced Reflectivity Switching at a Gallium-Silica Interface, Andrei Rode, Barry Luther-Davies, M. Samoc, Australian National University, Canberra, ACT, AUSTRALIA, K.F. MacDonald, UK, N.I. Zheludev, University of Southampton, Southampton, UK
Gallioum-silica interface exhibits a reflectivity change with a ~2ps initial rise-time when irradiated by 150-fs laser pulses with influences between a threshold value of 0.5 mJ/cm2 and the saturation level ~10 mJ/cm2.
 
 
CTuK84 14:30 - 16:00
Effectiveness of Electrode Curvature in Achieving Polarization Insensitive Intersecting Waveguide Type Optical
Switch/Modulators, Jamshid Nayyer, Takefumi Ueda, Kanazawa University, Kanazawa-shi, Ishikawa-ken, JAPAN, Minoru Yamada, Kanazawa University, Kodatsuno, JAPAN
Electrode curvature in the form of an exponential spiral is shown to be effective in achieving polarization insensitive optical switch / imodulators. The device reflectivity becomes polarization-independent once all guided mode spatial components are made to undertake total reflections.
 
CTuK85 14:30 - 16:00
Characteristics of Long-Wavelength-Band EDFA Pumped by 1.53µm band, B. Choi, H.-H. Park, Information & Communications University, Yusong, Taejon, KOREA, M. Chu, Electrical & Telecomm Research, KOREA
1.53µm band was proposed and investigated as new pump wavelength band of long wavelength-band Er3+ -doped fiber amplifier and compared with 1.48µm band. The gain coefficients of 1.53µm band pumping were two times greater than those of 1.48µm pumping.
 
 
CTuK86 14:30 - 16:00
All-Optical Interconnection by Matrix Switching with Photorefractive Two-Wave Mixing, Yasuhiko Nakanishi, Atsushi Okamoto, Tsutomu Nakada, , Satoshi Honma, Hokkaido University, Sapporo, JAPAN
We propose an all optical interconnection by matrix switching with photorefractive two-wave mixing and the erase beam. We estimate the property of matrix switching in consideration of the erase beam intensity.
 
CTuK87 14:30 - 16:00
The Influence of Modulation Index in Directly Modulated GCSR Lasers, Sam Rubin, E. Buimovitz, Dan Sadot, Ben Gurion University, Beer Sheva, ISRAEL
Tunable cost-effective WDM transmitters have recently become of tremendous interest in WDM networks. Here, the mode stability and side mode suppression ratio under direct modulation are studied and accordingly the transmitter performance is optimized.
 
 
CTuK88 14:30 - 16:00
Design of a Wavelength Multiplexing Planar Structure, Based on Periodic Dielectric Waveguides with Liquid-Crystal Substrates, Qin Zou, Institut National des Telecommunications, Evry Cedex, FRANCE, B.E. Benkelfat, INT Telecom, Evry, FRANCE
We show that it is possible to implement plannar structures for wavelength multiplexing at 1.55µm, by using periodic dielectric waveguides with liquid-crystal based substrates. The design of the nematic-phase configuration has been investigated. Some numerical results are given.
 
 
CTuK89 14:30 - 16:00
Cladding-Core Mode Coupling in a Fiber Bragg Grating Controlled by Acoustics for Multiplexing Application, Wen-Fung Liu, I-Ming Miu, Lung-Wei Chung, Chung Cheng Institute of Technology, Taoyuan, TAIWAN, R.O.C., Ding-Wei Huang, C. C. Yang, National Taiwan University, Taipei, TAIWAN, R.O.C.
Acoustics-excited micro-bending of a fiber Bragg grating is used to couple the cladding-mode power back to the core mode and hence switch the reflection window from the Bragg wavelength to another wavelength.
 
 
CTuK90 14:30 - 16:00
Influence of the Strain and the Temperature on the Grating Reflectivity, Arif Hidayat, Univ. des Sciences & Tech. de Lille, Villeneuve d'Ascq Cedex, FRANCE, Qinglin Wang, Wuhan Research Inst of Posts & Telcomm, Wuhan, CHINA, Pierre Niay, Marc Douay, Univ. des Sciences & Tech. de Lille, Villeneuve d'Ascq, FRANCE
This paper reports that strain and temperature cause a change in the reflectivity of Bragg gratings. This behavior is more significant in highly doped Ge fibers (DR/DT=0.00027C°-1,DR/De=6.2µe-1) than in standard fibers. The temperature ( the strain) of the fibers have to be specified when a reflectivity is measured with a high accuracy.
 
 
CTuK91 14:30 - 16:00
Accurate Modeling of the Cross-Talk Effects in Integrated Acousto-Optic Tunable Filters, Nicola Bellu, Guido Perrone, Ivo Montrosset, Politecnico di Torino, Torino, ITALY
An accurate model that considers effects of acoustical cross-talk, multiple interaction among optical and acoustical modes has been developed to predict the notch of acousto-optic tunable filters. Excellent agreement with experimental results has been achieved.
 
 
CTuK92 14:30 - 16:00
A High-Performance, Liquid-Crystal Based Optical Tunable Birefringent Filter, Qin Zou, Institut National des Telecommunications, Evry Cedex, FRANCE
We propose a tunable birefringent filter for optical telecommunication applications. It is based on liquid-crystal solc starks and a ring-cavity structure. The principle of the filter is described. Its performances is evaluated under usual technology considerations.
 
 
CTuK93 14:30 - 16:00
Efficient GaAs/AlGaAs Electroopitc Modulators on p-i-n Rib Waveguides with a Low Switching Voltage, Jong Chang Yi, Hong Ik University, Seoul, KOREA, Young Tae Byun, Sun Ho Kim, Korea Institute of Science & Technology, Seoul, KOREA
Efficient GaAs/ AlGaAs electrooptic modulators were fabricated on p-I-n rib waveguides to obtain a switching voltage smaller than 1 V/mm by utilizing the carrier plasma effect that is 10 times stronger that the linear electrooptic effect.
 
 
CTuK94 14:30 - 16:00
Analysis of a Novel n-AlGaAs Hot-Electron Optical Modulator, B.S. Ryvkin, A.F. Ioffe Physicotechnical Institute, Edinburgh, UK and Heriot-Watt University, Edinburgh, Scotland, UK, A.C. Walker, Heriot-Watt University, Edinburgh, Scotland, UK, E.A. Avrutin, University of York, UK
We propose and analyse an optical modulator operating through current-induced electron heating in n-AlGaAs materials for use in optical interconnects. Calculations predict efficient absorption modulation with operating voltages <1V and switching times of units of picoseconds.
 
 
CTuK95 14:30 - 16:00
1x8 Channel Power Splitter Using Multimode Interference Couplers in InP/InGaAsP, Kyung-Sook Hyun, Byueng-Su Yoo, Jeong-Soo Kim, Ilgu Yun, ETRI, Taejon, KOREA, Mu-Hee Cho, ETRI, Taejon, KOREA
8 channel multimode interference (MMI) power splitters were demonstrated using InP/ InGaAsP. 1x8 MMI power splitter has good power balance at each channel, and the operating wavelength range is more than 30 nm within 2 dB imbalance at each output port for aTE/TM incident mode.
 
 
CTuK96 14:30 - 16:00
Balanced Electroabsorption Modulated RF Photonic Link, Federica Cappelluti, Politecnico di Torino, Torino, ITALY and UCLA, Los Angeles, CA, USA, Sagi Mathai, Ming Wu, UCLA, Los Angeles, CA, USA, G. Ghione, Politecnico di Torino, Torino, ITALY
We propose a novel high linearity, low noise analog photonic link using a balanced electroabsorption modulator. It simultaneously cancels all common-mode intensity noises, even-order distortions and suppresses the third order intermodulation, achieving shot noise limited performance.
 
 
CTuK97 14:30 - 16:00
Practical Approaches for Reducing Pump Power Dependence of the Transparency Condition in Semiconductor Optical Amplifiers, Jian Ming Tang, Paul Spencer, Paul Rees, University of Wales, Bangor, Bangor, Wales, UK, K. Alan Shore, University of Wales, Bangor, UK
Novel techniques for significantly reducing the pump power dependence of the transparency characteristics in Semiconductor Optical Amplifiers (SOAs) are proposed, making use of high linear waveguide lossed, relatively long SOA devices and frequency detuned pulses.
 
 
CTuK98 14:30 - 16:00
Low Dissipative Ultrafast All-Optical Switching in Quantum-Well Semiconductor Microcavity, C. De Matos, M. Pugnet, LAAS - CNRS, Toulouse, FRANCE
Picosecond degenerate four-wave mixing experiments at room temperature in a GaInAs-GaInAsP multiple quantum well embedded in a microcavity are presented. For only 11µJ/cm2 pump fluence, ultrafast coherent all-optical switching is demonstrated based on the
optical Stark effect.
 
CTuK99 14:30 - 16:00
Realization of Bragg Gratings by Direct Photolithography on Ion Exchange Glass Waveguides, Roger Rimet, A. Fall, C. Behr, ENSERG, Grenoble, FRANCE, J.L. Bijeon, G. Wurtz, Universite Technologie de Troyes, Troyes, FRANCE
Effective Bragg gratings on glass waveguides are realized by direct submillimetric photolithograpghy (4000 periods) from a classic chrome mask and Reactive Ion Etching of grooves. The reflectivity pic width is only 0.16 nm around 1500nm.
 
 
CTuK100 14:30 - 16:00
All-Optical Modules for Compact Free-Space Laser Link Transceivers, Yuki Komai, Japan Women University, Tokyo, JAPAN, Rainer Hainberger, University of Tokyo, Tokyo, JAPAN, Werner Klaus, Communications Research Lab, Koganei,Tokyo, JAPAN, Kashiko Kodate, Japan Women University, Tokyo, JAPAN, Takeshi Kamiya, University of Tokyo, Tokyo, JAPAN
All-optical modules employing liquid crystal optics, diffractive lenses and semiconductor saturable absorber switching have been designed and fabricated to realize compact and low power consuming free-space laser link transceivers.
 
 
CTuK101 14:30 - 16:00
Autocorrelation of Femtosecond Pulses from 415 - 630 nm Using a GaN Laser Diode, P. Loza-Alvarez, Wilson Sibbett, Derryck Reid, University of St. Andrews, St. Andrews, Fife, UK
Using the two-photon response of a commerical 393 nm GaN laser diode we have measured intensity and interferometric second-order autocorrelations of visible femtosecond pulses in the 415 - 630 nm wavelength region for pulse energies as low as 1 pJ.
 
 
CTuK102 14:30 - 16:00
Measurement of Space and Time Profile of Shaped Ultrafast Optical Pulses Using Spatial-Spectral Interference, Takasumi Tanabe, N. Takei, H. Tanabe, Y. Teramura, Fumihiko Kannari, Keio University, Yokohama, JAPAN
We applied spatial spectral interferometry method to measure space and time intensity distributions of ultrashort optical pulses shaped by a Fourier pulse shaper.
 
 
CTuK103 14:30 - 16:00
Compact Femtosecond Auto-correlator Based on a Swinging Birefringent Plate, Serguei Kobtsev, S.V. Kukarin, V.B. Sorokin, Novosibirsk State University, Novosibirsk, RUSSIA
Proposed and investigated a new method to introduce a variable temporal delay of ultra-short pulses with the help of a birefringent crystal. Temporal scanning range of the auto-correlator developed on the basis of this method amounts to as long as Dt=±230 fs (l=800nm). Demonstrated are the recorded autocorrelation functions for 30-fs Ti:Sapphire laser.
 
 
CTuK104 14:30 - 16:00
Arbitrary Shaping of Amplified Femtosecond Pulses with Phase-Only Filters, Kazuya Takasago, Femtosecond Technology Association, Tsukuba, JAPAN, Akira Yada, Waseda University, JAPAN, Taisuke Miura, Keio University, Yokohama, JAPAN, Masakazu Washio, Waseda University, JAPAN, Fumihiko Kannari, Keio University, Yokohama, Kanagawa, JAPAN, Zhigang Zhang, New Energy & Industrial Tech Dev Org, JAPAN, Kenji Torizuka, Electrotechnical Laboratory, Ibaraki, JAPAN, Akira Endo, Femtosecond Technology Association, Tsukuba, JAPAN
We obtained submilli-joule and arbitrarily shaped femtosecond pulses with phase-only filters designed by simulated annealing optimization algorithm for shaped pulses. The femtosecond pulse shaping apparatus was placed between an oscillatior and a regenerative amplifier.
 
 
CTuK105 14:30 - 16:00
Efficient Control of Automatic Pulse Compressor in Chirped Pulse Amplification System, T. Imahoko, Keio University, Yokohama, JAPAN, Kentarou Furusawa, Keio University, Yokohama, JAPAN, Minoru Obara, Keio University, Yokohama, JAPAN
In order to improve the precision in the femtosecond automatic pulse compressor developed by Keio, we introduced new parameters that can be measured using SPIDER. The reduced number of iterations and increase of the accuracy is reported.
 
 
CTuK106 14:30 - 16:00
Noise of a Regeneratively Synchronized GHz Passively Mode-Locked Fiber Laser, Charles Yu, M. E. Grein, H. A. Haus, E.P. Ippen, MIT, Cambridge, MA,
We measure the noise of a regeneratively synchronized passively modelocked laser. The noise is comparable to an actively modelocked laser and comparison with theory shows the jitter of a white noise origin is due to quantum noise.
 
 
CTuK107 14:30 - 16:00
Amplification of Femtosecond Laser Pulses Beyond the Gain Narrowing Limit, Alexander Mueller, M. Hentschel, Technische Universitaet Wien, Wien, AUSTRIA, A. Cheng, Femtolasers GmbH, Wien, AUSTRIA, M. Laubscher, Ferenc Krausz, Technische Universitaet Wien, Wien, AUSTRIA, Christian Spielmann, Vienna University of Technology, Vienna, AUSTRIA
Design guidelines for the generation of nearly transform limited sub-15fs intense laser pulses are presented. Different methods for reducing gain narrowing and phase errors are discussed.
 
 
CTuK108 14:30 - 16:00
Controlling Spatially Varying Dispersion in Multiterawatt Ti:Sa Chirped-Pulse Amplification Lasers, M.P. Kalachnikov, Max-Born-Institute, Berlin, GERMANY, H. Schoennagel, P.V. Nickles, W. Sandner, Max-Born-Institute, Berlin, GERMANY
3- dimensional ray tracing has shown that lateral variation of dispersion in CPA lasers can lead to a bending of amplitude front after recompression. Optical arrangements for controlling of the bend are presented.
 
 
CTuK109 14:30 - 16:00
Passively Mode - Locked Semiconductor Diode Laser with a Ring Cavity, Michel Piche, L. Desbiens, P. Langlois, A. Yesayan, Universite Laval, Quebec, CANADA
Pulses as short as one picosecond have been generated at repetition rates ranging from 300MHz to 3 GHz using an angle etched travelling wave amplifier in a ring cavity. Dual-wavelength operation is demonstrated.
 
 
CTuK110 14:30 - 16:00
Studies on Carrier Transport in InGaAlAsP/InGaAsP Quantum Well Structures Emitting at 1.3 µm, Roberta Campi, Saulius Marcinkevicius, Gunnar Landgren, Royal Institute of Technology, Kista, SWEDEN
Effect of adding aluminium to the barriers in InGaAsP laser structures are explored by studying properties of broad strip lasers and interwell carrier transport. Increase of the electron confinement improves the high temperature characteristics and causes a certain increase of the transport time.
 
CTuK111 14:30 - 16:00
Compact Semiconductor Absorber Mode-Locked Nd:YAG Laser, Uwe Griebner, Martin Leitner, Peter Glas, Max-Born-Institute, Berlin, GERMANY, B. Ozygus, Smart Laser System GmbH, Berlin, GERMANY, R. Hey, L. Däweritz,Paul-Drude-Institut, Berlin, GERMANY
We report on laser performance of a passively mode-locking end-on diode-pumped Nd:YAG laser. Stable self-starting mode-locking with a pulse duration of 8ps and a pulse energy of 3nJ by the use of a multiple quantum well absorber is achieved.
 
 
CTuK112 14:30 - 16:00
Saturation of Intense THz-Radiation Power from Femtosecond-Laser Irradiated InAs in a High Magnetic Field, Hideyuki Ohtake, Institute for Molecular Science, Okazaki, JAPAN, Shingo Ono, Science University of Tokyo, Tokyo, JAPAN, Masahiro Sakai, Zhenlin Liu, Nobuhiko Sarukura, Institute for Molecular Science, Okazaki, JAPAN, THz-radiation power from femtosecond pulse irradiated InAs is found to be saturated at the high magnetic field around 3 T. We have also observed interesting dependence of the frequency and the spectral width of the radiation.
 
 
CTuK113 14:30 - 16:00
Optical Properties of Glasses and Ceramics for Terahertz-Technology, H. Selig, M Khazan, Ingrid Wilke, Universitaet Hamburg, Hamburg, GERMANY
The complex index of refraction of Robax, blue membrane glass, Macor, bor silica and quartz have been measured by time-domain THz-transmission spectroscopy for use in optical design at Thz-frequencies.
 
 
CTuK114 14:30 - 16:00
Ultrashort Laser-Solid Interaction: Ionisation, Absorption, and Ablation, E.G. Gamaly, Andrei Rode, Australian National University, Canberra, AUSTRALIA
The model for the ultrashort laser-matter interaction with suppressed hydrodynamic and suppressed energy transfer is presented. The ablation thresholds for metals and dielectrics as functions of laser and target parameters are compared to experiments.
 
 
CTuK115 14:30 - 16:00
Propagation of Intensive Ultrashort Light Pulses with Zero Group Dispersion Wavelengths, Yuri Shpolyanskiy, V.G. Bespalov, Institute of Fine Mechanics & Optics, St. Petersburg, RUSSIA, S.A. Kozlov, St. Petersburg State Institute, St. Petersburg, RUSSIA
It is shown that zero group dispersion wavelength decreases in waveguide in comparison with pure medium one. The nonlinear propagation of ultrashort pulses with spectra in zero group dispersion region is investigated.
 
CTuK116 14:30 - 16:00
The Influence of Gain-Saturation on Kerr-Lens Mode Locking of Cr:LiSAF Laser, P. Russbueldt, K. Gaebel, R. Lebert, Lehrstuhl fuer Lasertechnik, Aachen, GERMANY, Reinhart Poprawe, Fraunhofer Institut fuer Lasertechnik, Aachen, GERMANY
Kerr lens mode locking of a Cr:LiSAF laser requires a stronger eccentricity of the laser-crystal than the models, developed for Ti:Sapphire, predict. The extension of an existing model to gain saturation explains the discrepancy.
 
 
CTuK117 14:30 - 16:00
Numerical Study of a Femtosecond Pulse Generation Using Quadratic Polarisation Switching CW Mode-Locking, F. Louradour, Alain Mugnier, V. Couderc, Alain Barthelemy, IRCOM, Limoges, FRANCE
Quadratic polarisation switching mode-locking is studied during numerical simulation of a femtosecond CW laser. This numerical approach is applied to the case of a 1 W Ti:Sapphire laser with a BBO intracavity doubling crystal predicting as short as 100fs pulse generation.
 
 
CTuK118 14:30 - 16:00
Comparison of c(3) and Cascaded c(2) Contributions to the Nonlinear Index of Refraction of a Cubic Crystal: Influence of Optical Rectification, J.P. Caumes, Universite Bordeaux 1, Talence Cedex, FRANCE, S. Estival, Universite Bordeaux 1, Talence Cedex, FRANCE, P. Langot, Universite Bordeaux 1, Talence Cedex, FRANCE, Eric Freysz, Universite Bordeaux 1, Talence Cedex, FRANCE, L. Videau, Cl. Rouyer, Commissariat a l'Energie Atomique, Le Barp, FRANCE
Temporal behaviors and relative amplitudes of both third-order and cascade second order contributions due to optical rectification and electro-optic effect to the nonlinear index of refraction of cubic crystals are evaluated in femtosecond regime.
 
 
CTuK119 14:30 - 16:00
Stabilization of the Frequency and Repetition Rate of a Femtosecond Pulse Train to a Fabry-Perot Reference Cavity, R. Jason Jones, Jean-Claude Diels, University of New Mexico, Albuquerque, NM, USA
The carrier frequency, phase, and repetition rate of an ultra-short pulse train is stabilized by locking its comb of more than 500,000 longitudinal modes to a Fabry-Perot reference cavity.

 
 
IQEC POSTERS
 
IQEC Poster Session
14:30 - 16:00
Room: Mediterranee
 
QTuE1 14:30 - 16:00
Linewidth Narrowing in Brillouin Fiber Lasers, A. Debut, Stephane Randoux, J. Zemmouri, Universite des Sciences & Technologies de Lille, Villeneuve d'Ascq Cedex, FRANCE
In Brillouin fiber lasers, the phase fluctuations of the pump laser are transferred to the emitted Stokes wave after being strongly reduced. This results in a linewidth narrowing that we study both theorectically and experimentally.
 
 
QTuE2 14:30 - 16:00
Phase Control Reduction of Four-Wave Mixing in Induced Waveguiding Scheme, D. Bortman-Arbiv, A.D. Wilson-Gordon, H. Friedmann, Bar-Ilan University, Ramat Gan, ISRAEL
Waveguiding maybe induced in a weak probe propagating in a two-level medium driven by an intense copropagating pump. Four-wave mixing which limits the waveguiding can be reduced by controlling the phases of the lasers.
 
 
QTuE3 14:30 - 16:00
Effect of Propagation on Pulsed Four-Wave Mixing, P. Weisman, A.D. Wilson-Gordon, H. Friedmann, Bar-Ilan University, Ramat Gan, ISRAEL
We study the effect of propagation on the FWM spectrum, obtained when a temporally nonoverlapping coherent pump pulse of arbitrary intensity and a weak probe pulse interact with a medium of two-level atoms.
 
 
QTuE4 14:30 - 16:00
Asymptotic Theory of Instabilities in Directly Modulated Semiconductor Lasers, Catalina Mayol, Universidad de las Islas Baleares, Palma de Mallorca, SPAIN, S. I. Turovets, Instituto de Fisica de Cantabria, Santander, SPAIN, Raul Toral, Claudio Mirasso, Universidad de las Islas Baleares, Palma de Mallorca, SPAIN, Luis Pesquera, Instituto de Fisica de Cantabria, Santander, SPAIN
Analytical boundaries for the primary saddle-node bifurcations in pump-modulated laser diodes are obtained. Numerical simulations agree very well with theoretical results. Gain saturation and spontaneous emission terms are considered in the model.
 
 
QTuE5 14:30 - 16:00
Dynamical Behavior of Mutually-Coupled Semiconductor Lasers: Modelling and Simulations, Josep Mulet, Universidad de las Islas Baleares, Palma de Mallorca, SPAIN, Tilmann Heil, Darmstadt University of Technology, Darmstadt, GERMANY, Claudio Mirasso, Universidad de las Islas Baleares, Palma de Mallorca, SPAIN, Ingo Fisher, Darmstadt University of Technology, Darmstadt, GERMANY
We numerically study the dynamical behavior of two mutually coupled semiconductor lasers under different coupling strengths and detunings. We observe a transition from LFF to periodic fast oscillations that agrees very well with the experiments.
 
 
QTuE6 14:30 - 16:00
Multisoliton Generation in a Fibre Bragg Grating Disperion Managed System, Juan Castanon, Priscila Garcia Fernandez, Jose Crespo, Instituto de Optica, Madrid, SPAIN
The influence on the formation of multisoliton pulses in a dispersion managed system with fibre Bragg gratings of third-order dispersion in the fibre link and experimental deviation from the ideal grating parameters is studied.
 
 
QTuE7 14:30 - 16:00
Nonadiabatic Effects in Optical Pattern Formation, Stefano Longhi, Politecnico di Milano, Milano, ITALY
Patterns in cavity optical systems can occur for a resonated field red-shifted from cavity resonance under nonadiabatic periodic modulation of detuning. This novel mechanism of pattern formation goes beyond the simpler geometric tilted-wave picture.
 
 
QTuE8 14:30 - 16:00
Nonlinear Dynamics of Self Phase-Locked Frequency Divide-by-Three Optical Parametric Oscillators, Jean-Jacques Zondy, Observatory of Paris, Paris, FRANCE, Andree Tallet, Universite Paris-Sud, Orsay Cedex, FRANCE
The dynamics of optical parametric oscillators in presence of resonant c(2)(-3w; w, 2w): c(2) (-2w; w, w) cascading is theoretically investigated. The cascaded nonlinearities lead of self phase-locking of the subharmonic waves and to a variety of nonlinear dynamics (bistability, self-pulsing).
 
 
QTuE9 14:30 - 16:00
Effect of Size and Surface Modification on First Hyperpolarizability of CdS Nanoparticles, B. S. Santos, G. A. L. Pereira, D. V. Petrov, C. De Mello Donega, Universidade Federal de Pernambuco, Recife, PE, BRAZIL
The first hyperpolarizability of nanocrystalline CdS particles (mean diameter of 2.0 - 9.1nm ) was determined by Hyper-Rayleigh Scattering measurements. The effect of surface modification (by Pt-loading or OH- coating) is also discussed.
 
 
QTuE10 14:30 - 16:00
Nonlinear Phase Modulation as a Broadening Mechanism in a Multimode Erbium-Doped Fiber Ring Laser, V. Roy, Universite Laval, Quebec, CANADA, Michel Piche, Universite Laval, Cite Universitaire, QC, CANADA, Francois Babin, EXFO Inc., Vanier, Quebec, CANADA
We investigate how self-phase modulation and cross-phase modulation affect the number of longitudinal modes oscillation inside an erbium-doped fiber ring laser. The experimetnal results can be fitted by a simple model.
 
 
QTuE11 14:30 - 16:00
Experimental Evidence of Stochastic Resonance in Vertical Cavity Surface Emitting Lasers, Francesco Marin, Universita di Firenze, Firenze, ITALY, G. Giacomelli, S. Barbay, Instituto Nazionale di Ottica Applicata, Firenze, ITALY
We present a complete experimental characterization of Stochastic Resonance in Vertical Cavity Surface Emitting Lasers. Our apparatus allows an unprecedented comparison with existing theories and numerical studies.
 
 
QTuE12 14:30 - 16:00
Computer-Aided Determination of Existence and Stability of Optical Patterns, Graeme Harkness, William Firth, Gian-Luca Oppo, University of Strathclyde, Glasgow, UK
We present a tenchnique for finding stable and unstable stationary solutions to models for optical systems. We determine the stability of pattern solutions as a function of their wavevector and the input pump.
 
 
QTuE13 14:30 - 16:00
Adaptive Control of Chaos in a Delayed High Dimensional Laser System, Riccardo Meucci, F. Arecchi, M. Ciofini, A. Labate, Instituto Nazionale di Ottica Applicata, Firenze, ITALY
We introduce a novel control method for a delayed dynamical system exhibiting high dimensional chaos. The control, based on a negative feedback loop with adaptive filtering, is particularly apt to stabilize irregular pseudo spatial patterns.
 
QTuE14 14:30 - 16:00
Low-Threshold Spatial Solitons and Instabilities in Optical Parametric Oscillators, Gian-Luca Oppo, Andrew Scroggie, S. Sinclair, I. Rabbiosi, University of Strathclyde, Glasgow, Scotland, UK, Massimo Brambilla, Universitá e Politecnico di Bari, Bari, ITALY
Very low thresholds for the formation of cavity solitons, hexagons and other complex spatio-temporal phenomena are found in optical parametric oscillators with a higher finesse for the pump field than for the signal field.
 
QTuE15 14:30 - 16:00
Theoretical Study of Solid State Lasers, Veronique Zehnlé, Universite des Sciences & Technologies de Lille, Villeneuve d'Ascq Cedex, FRANCE
We establish a semi-classical description for a system of coupled solid state lasers in a monolithic crystal. The dynamical behaviors of the lasers are analyzed an the influence of coupling parameters is evidenced.
 
 
QTuE16 14:30 - 16:00
Generation of Continuous-wave THz Radiation by use of Quantum Interference, E. Korsunsky, Technische Universitaet Berlin, Graz, AUSTRIA
It is proposed that continuous-wave THz radiation can be efficiently generated by use of quantum interference in a medium having L Configuration of levels, with the THz-transition between two lower states.
 
 
QTuE17 14:30 - 16:00
Transverse Patterns in Degenerate Optical Parametric Oscillators; Specific Reference to Roll Patterns, M. J. Shelton, Dave West, University of Manchester, Manchester, UK
Roll pattern formation in a Degenerate Optical Parametric Oscillator close to the oscillator threshold is presented. The dependence of roll pattern on cavity detuning is compared with the theory.
 
QTuE18 14:30 - 16:00
Adaptive Image Transmission with a Pattern Forming System, Michael Schwab, Cornelia Denz, Darmstadt University of Technology, Darmstadt, GERMANY
We investigate the possibility of transmitting information into the channels produced by a pattern forming system. First experimental results for image transmission of simple geometric figures are presented, proving the principle function of this adaptive image processing system.
 
 
QTuE19 14:30 - 16:00
Nonlinear Atomic Response in Superstrong Spatially Inhomogeneous Field, A. B. Kozlov, Anatoli Andreev, Moscow State University, Moscow, RUSSIA
It is shown that in the inhomogeneous field the generation of even harmonics in response of an isotropic medium became possible. The angular and polarization spectra at second and third harmonics of atomic response are compared.
 
 
QTuE20 14:30 - 16:00
Phase Equations for Periodically Driven Injected Lasers, M Nizette, T. Erneux, Universite Libre de Bruxelles, Bruxelles, BELGIUM
Motivated by recent experiments, we consider the response of periodically modulated diode lasers subject to strong injection. We derive phase equations for the locking of the laser limit-cycle oscillations.
 
QTuE21 14:30 - 16:00
Cumulative Phenomena In Parametric Frequency Conversion of Conical Beam, Algis Piskarskas, V. Smilgevieius, A. Stabinis, Vilnius University, Vilnius, LITHUANIA
The results of theoretical and experimental investigation of parametric conversion of coherent and incoherent conical beams are presented. Special attention is paid to the problem of cumulative action of the incoherent conical pump and output patterns formation in OPO and OPG.
 
QTuE22 14:30 - 16:00
Intensity Rate Equations to Describe Polarisation Switching in Vertical-Cavity Surface-Emitting Lasers, Bob Nagler, J. Albert, Jan Danckaert, Michael Peeters, Krassimir Panajotov, Irina Veretennikoff, Vrije Universiteit Brussel, Brussels, BELGIUM, T. Erneux, Universite Libre de Bruxelles, Bruxelles, BELGIUM
A simple intensity rate equation model with two nearly degenerate modes can explain the switching characteristics, the dynamical behaviour, and the mode hopping of current induced polarisation switching in Vertical-Cavity Surface-Emitting Lasers.
 
QTuE23 14:30 - 16:00
Soliton Propagation in BSO Crystals with Strong Optical Activity, E. Fazio, A. Funto, F. Mariani, M. Bertolotti, Universita di Roma La Sapienza, Roma, ITALY, V. Babin, V. Vlad, Institute of Atomic Physics, Bucharest, ROMANIA
Screening solitons in photorefractive materials with high optical activity (BSO crystals with 45°/mm) have been theoretically predicted. 1D-soliton have been experimentally monitored. Testing of 2D solitons are at the moment in progress.
 
 
QTuE24 14:30 - 16:00
Experimental Bifurcation Diagrams of a Dual-Wavelength Erbium-Doped Fiber Laser, G. M. Ginovart, G. M. Stephan, Pascal Besnard, ENSSAT, Lannion, FRANCE, P. Le Boudec, IDIL, Lannion, FRANCE
An erbium-doped fiber laser can exhibit a quasi periodic route to chaos when it is operating on two wavelengths. We present here for the first time the experimental bifurcation diagram of such a dual wavelength laser and we compare these results to theoretical simulations.
 
 
QTuE25 14:30 - 16:00
Soliton-like Solutions in a Configuration of a ps- and ns-pulse Propagating Simultaneously in a Kerr-type Planar Waveguide, Monika Pietrzyk, Universitaet Jena, Jena, GERMANY
We consider two optical pulses propagating simultaneously in a Kerr-type planar waveguide with anomalous dispersion. We show, using the variational and numerical method, that when dispersion of one pulse vanishes soliton-like solutions can arise.
 
 
QTuE26 14:30 - 16:00
Efficient 1D and 2D Selfocusing and Quasi-Steady-State Solitons in BSO Crystals Without Background Illumination, A. Funto, F. Mariani, M. Bertolotti, Universita di Roma La Sapienza, Roma, ITALY, V. Vlad, V. Babin, Institute of Atomic Physics, Bucharest, ROMANIA, E. Fazio, Universita di Roma La Sapienza, Roma, ITALY
Efficient 1-D and 2-D selfocusing and soliton-like propagation have been observed in BSO crystals without background illumination at external bias fields lower than the steady-state soliton-formation ones. Theoretical description of the phenomenon is presented.
 
 
QTuE27 14:30 - 16:00
Critical Slowing - Down in Photorefractive Scattering Below the Self-Oscillation Threshold, Pierre Jullien, Pierre Mathey, Universite de Bourgogne, Dijon Cedex, FRANCE, S.G. Odoulov, O. Shinkarenko, Ukranian Academy of Science, Kiev-22, UKRAINE
For semilinear coherent oscilator with two counterpropagating pump waves the relaxation time of photorefractive gratings drastically increases in close vicinity but below the oscillation threshold. The analogy with the second order transition is discussed.
 
 
QTuE28 14:30 - 16:00
Gigantic Broadband Optical Nonlinearity in Gallium Films Deposited By Ultrafast Laser Ablation, Vassilios Albanis, V.A. Fedotov, K.F. MacDonald, V.I, Emelyanov, University of Southampton, Southampton, Hampshire, UK, N.I. Zheludev, University of Southampton, Southampton, UK, R.J. Knize, B.V. Zhdanov, US Air Force Academy, Colorado Springs, CO, USA, Andrei Rode, Australian National University, Canberra, ACT, AUSTRALIA
Gallium/silica interfaces prepared by ultrafast pulsed laser ablation show a gigantic optical nonlinearity of the order of x(3)~1 esu (estimate for cw excitation) from at least 480 to at least 1550 nm.
 
 
QTuE29 14:30 - 16:00
The Multistability of Acoustooptic Interaction in Gyrotropic Cubic Crystals in the Presence of a Frequency Feedback, A.N. Kovchur, National Academy of Sciences of Belarus, Minsk, BELARUS, S.N. Kurilkina, Gomel State University, Gomel, BELARUS
The condition of realization of the multistability regims of acoustooptic interaction in cubic gyrotropic crystals in the presence of a frequency feedback has been determined. It has been established that the presence of gyrotropy leads to appearance of not one but two regions of electrical multistability which are achieved by low values of basic voltage applied to piezotransducer.
 
 
QTuE30 14:30 - 16:00
Chaotic Laser as an Amplifier of Periodic Signals via Determinsitic Stochastic Resonance, V.N. Chizhevsky, National Academy of Sciences of Belarus, Minsk, BELARUS, R Corbalan, Universitat Autonoma de Barcelona, Bellaterra, SPAIN
We demonstrate experimentally and numerically that a chatoic CO2 laser operating in the region of crisis-induced intermittency can serve as an amplifier of near-resonant signals with a gain factor which is by several times larger than the near the first period-doubling bifurcation point.
 
 
QTuE31 14:30 - 16:00
Cavity Solitons in Kerr Resonators, Victor Sanchez-Morcillo, I. Perez-Arjona, F Silva, German de Valcarcel, Eugenio Roldan, Universitat de Valencia, Burjassot, SPAIN
It is shown that an anisotropic Kerr cavity can supprt both bright and dark cavity solitons. A parametrically driven Ginzburg-Landau equation is shown to describe the system for large cavity anisotropy. In one transverse dimension the dynamics is numerically investigated.
 
 
QTuE32 14:30 - 16:00
Multimode Instability in Ring Fibre Lasers. Inhomogeneous Broadening and Modal Structure, Eugenio Roldan, German de Valcarcel, Universitat de Valencia, Burjassot, SPAIN, F. Prati, Universita dell'Insubria, Como, ITALY, F Silva, Universitat de Valencia, Burjassot, SPAIN, J.F. Urchueguia, Universitat de Valencia, Burjassot, SPAIN
The inhomogeneous broadening and modal structure imposed by the fibre are shown to largely affect the multimode instability of erbium doped ring fibre lasers. Optimum conditions for single mode operation are investigated.
 
 
QTuE33 14:30 - 16:00
New Results on Ring Dark Solitons, Kestutis Staliunas, Physikalisch-Technische Bundesanstalt, Braunschweig, GERMANY, Victor Sanchez-Morcillo, Universitat de Valencia, Burjassot, SPAIN
The stability of ring dark solitons in DOPOs is investigared, taking into account the effect of the spatial modulations of the domain boundaries and the presence of an injected signal. Such effects result in description closer to realistic conditions.
 
 
QTuE34 14:30 - 16:00
Optical Pattern in Nonlinear Semiconductor Microcavities, Isabelle Ganne, CNET, Bagneux cedex, FRANCE, G. Slekys, CNET, Bagneux cedex, FRANCE, I. Sagnes, CNRS/CNET, Bagneux cedex, FRANCE, Robert Kuszelewicz, CNET, FRANCE
Patterns have been evidenced in GaAs/GaAlAs vertical-cavity microresonators. Rolls, rhomboedrons and hexagons could be observed depending on the wavelength detuning. We show and discuss on how cavity resonance fluctuations affect the mechanisms of pattern selection.
 
 
QTuE35 14:30 - 16:00
Control of Tunneling Oscillations Between Two Coupled Bose-Einstein Condensates by 2p Pulse Excitations, Noriaki Tsukada, Aomori University, Aomori, JAPAN
Dynamical transitions between the macroscopic quantum self-trapping and large amplitude tunneling oscillations in weakly couple Bose-Einstein condensates is predicted to occur when one of the condensate state is excited by short laser pulses.
 
 
QTuE36 14:30 - 16:00
Dynamics of Broad Area Diode Lasers with Phase Conjugate Feedback, J.S. Lawrence, Macquarie University, Sydney, NSW, AUSTRALIA, D.M. Kane, Macquarie University, Sydney, NSW, AUSTRALIA
Transition into dynamic instability for a broad area diode laser with phase conjugate feedback is distinct from conventional optical feedback and single-mode diode laser behaviour.
 
 
QTuE37 14:30 - 16:00
Multistability in Optically Injected Semiconductor Lasers, Sebastian Wieczorek, Daan Lenstra, Vrije Universiteit, Amsterdam, THE NETHERLANDS, Bernd Krauskopf, University of Bristol, Bristol, UK
Bifurcations analysis reveals regions in parameter space where attractors of suprisingly many different types like stationary points, periodic orbits, quasiperiodic oscillations and chaos coexist.
 
 
QTuE38 14:30 - 16:00
Enhanced Light Emission in Organic Quasiperiodic - One Dimensional Photonic Band Gap Structures, C. Sibilia, G Santilli, M. Bertolotti, Universita di Roma La Sapienza, Roma, ITALY, M. Scalora, M.J. Bloemer, C.M. Bowden, US Army Missile & Aviation Command, Redstone Arsenal, AL, USA
Near the band edge of a one dimensional quasiperiodic photonic band gap structure, the density of modes of a quasiperiodic structure is more larger than the one of a periodical layered structure. If an active medium, as an photoluminescent polymer is present inside the structure, an large enhancement of the gain is found. A comparison among different geometries is performed.
 
 
QTuE39
Low-Frequency Fluctuations in a Multimode Semiconductor Laser with Optical Feedback, F. Rogister, P. Mégret, O. Deparis, M. Blondel, Polytechnique de Mons, Belgium
The dynamics of a multimode laser diode in the low-frequency fluctuations regime is investigated numerically. For close values of the injection current, the laser intensity exhibits either pulses or fast fluctuations around its mean value.

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