EQEC'96. 1996 European Quantum Electronic Conference最新文献

{"title":"Two-Photon Selective Reflection","authors":"M. Gorris-Neveaux, P. Monnot, S. Saltiel, M. Ducloy, R. Barbé, J. Keller","doi":"10.1109/EQEC.1996.561694","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561694","url":null,"abstract":"The conditions of observation of direct two-photon-induced dispersion in three-level reflection spectroscopy at a vapor-dielectric interface are discussed. One shows how pump frequency modulation allows one to discriminate the two-photon singular contribution associated with atoms moving quasiparallel to the dielectric interface, and therefore single out off-resonant Doppler-free two-photon dispersion in selective reflection. A nonperturbative theoretical approach to two-photon reflection is shown to predict a dynamic Stark shift of the two-photon resonance, which has been experimentally observed on the 6S-6P-8S transition of cesium. @S1050-2947~96!06009-X#","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"13 3 1","pages":"107-107"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74645685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-Frequency Chaos in Semiconductor Lasers with External Feedback","authors":"N. Swanstom, D. Yu, W. Lu, J. Kollmer, R. Harrison","doi":"10.1142/9789814531115","DOIUrl":"https://doi.org/10.1142/9789814531115","url":null,"abstract":"Sciiiiconductor diode lasers subject to external optical phase-conjugate feedback exhibit beh;ivior which can differ radically from the cffects of conventional optical feedback. Some of thcsc dilferences were reviewed for the case of a single-longitudinal mode semiconductor lascr [ 1 ). When the semiconductor laser oscillates in mullipte longitudinal modes, phase conjugetc feedback obtained through four-wave mixing can lead to mode locking and short-pulse","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"137 1","pages":"165-165"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79720942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser Beam Self-Channeling in a Photorefractive Waveguide Caused by Fanning Effect","authors":"A. Kamshilin, E. Raita, A. Khomenko","doi":"10.1117/12.2316076","DOIUrl":"https://doi.org/10.1117/12.2316076","url":null,"abstract":"We report an experimental observation of the light beam self-channeling inside the photorefractive Bi12TiO20 waveguide-like sample. The phenomenon occurs when the strong fanning effect takes place. Total internal reflections of fanned beams from the waveguide surfaces and their coupling with the pump beam result in the light intensity redistribution inside the photorefractive waveguide. The self-induced channel of the increased light intensity speeds up the photorefractive energy exchange process.","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"70 1","pages":"138-138"},"PeriodicalIF":0.0,"publicationDate":"1996-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78448954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Observation of Spatial solitons in Polymer Waveguides","authors":"U. Bartuch, U. Peschel, T. Gabler, R. Waldhaust, H. Horhold","doi":"10.1117/12.2316073","DOIUrl":"https://doi.org/10.1117/12.2316073","url":null,"abstract":"We investigated the beam propagation in a planar polymer waveguide. The formation of a spatial soliton is observed.","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"126 1","pages":"229-229"},"PeriodicalIF":0.0,"publicationDate":"1996-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87752413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bose-Einstein Condensation in a Gas of Sodium Atoms","authors":"K. B. Davis, M. Mewes, M. R. Andrews, N. V. Druten, D. Durfee, D. M. Kurn, W. Ketterle","doi":"10.1109/EQEC.1996.561567","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561567","url":null,"abstract":"We have observed Bose-Einstein condensation of sodium atoms. The atoms were trapped in a novel trap that employed both magnetic and optical forces. Evaporative cooling increased the phase-space density by 6 orders of magnitude within seven seconds. Condensates contained up to 5 3 105 atoms at densities exceeding 1014 cm23. The striking signature of Bose condensation was the sudden appearance of a bimodal velocity distribution below the critical temperature of , 2 mK. The distribution consisted of an isotropic thermal distribution and an elliptical core attributed to the expansion of a dense condensate.","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"50 1","pages":"39-39"},"PeriodicalIF":0.0,"publicationDate":"1996-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90550700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Direct Simulation of Evaporative Cooling","authors":"Huang Wu, C. Foot","doi":"10.1109/EQEC.1996.561603","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561603","url":null,"abstract":"We have simulated the evaporative cooling of trapped atoms using a very efficient method originally introduced for the study of molecular gas dynamics. This straightforward and intuitive method allows the dynamics of the evaporative cooling process to be studied and requires fewer simplifications and assumptions than other methods. In particular, the method is not restricted to distributions close to equilibrium and therefore it can model accurately rapid forced evaporative cooling, which is an important technique for cooling trapped atoms. We present the results of simulations for forced evaporative cooling in one, two and three dimensions.","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"32 1","pages":"57-57"},"PeriodicalIF":0.0,"publicationDate":"1996-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77788222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coherent Excitation of a He* Beam Observed in Atomic Momentum Distributions","authors":"C. Kurtsiefer, C. Ekstrom, D. Voigt, O. Dross, T. Pfau, J. Mlynek","doi":"10.1109/EQEC.1996.561744","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561744","url":null,"abstract":"We report on an experimental investigation of coherent optical excitation processes for an atomic two-level system in metastable helium. A simple absolute measure of the excitation probability is obtained from the deflection of an atomic beam, as excited atoms receive an additional momentum corresponding to a single photon recoil. With this method, we investigate the excitation process as a function of laser power, wavefront curvature and interaction time. Rabi oscillations are seen in the center-of-mass motion of an atomic ensemble for small wavefront curvatures, which change to adiabatic transfer produced by a Doppler detuning chirp for large wavefront curvatures. The adiabatic transfer provides a simple method for complete excitation of an atomic two-level system.","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"36 1","pages":"132-132"},"PeriodicalIF":0.0,"publicationDate":"1996-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81102970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamical Density Grating in a Hot Vapor","authors":"G. Lippi, S. Barbay, G. Barozzi, A. Roux, J. Tredicce","doi":"10.1109/EQEC.1996.561510","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561510","url":null,"abstract":"We create ii dark optical lattice structure in ii scanding wave tuned to the blue of the F=3 to F=3 Irtinsition ofthe XSRubidiuin DI-line. The coupling of the F=3 ground slate lo both the F=2 and F=3 excited states induces a periodic potential i n which the atoms are trapped at locations of purely circular polarisation, wherc they itre only weakly coupled to the light field. We adiabatically release the atoms rrom the optical lattice and measure their inomentuin distribution with a resolution of one third of 21 single photon recoil. During the adiabatic release the quasi-momentum and the population of the energy bands are conserved. The population of the lowest energy band is mapped on the -hk to +hk momentum interval of the free atom, and the first energy band is mapped on the two momentum intervals -2hk to -hk and hk to 2hk. The figure shows the measured populations i n comparision with those determined by a numerical simulation, which uses a rate equation approach to obtain the steady state populations of the Bloch states.","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"30 1","pages":"6-6"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73538832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interference of Bound-Bound and Bound-Free Transitions in Strong Lser Fields","authors":"A. Popov, V.V. Kinberg","doi":"10.1109/EQEC.1996.561813","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561813","url":null,"abstract":"","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"58 1","pages":"171-171"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73837111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of the Laser-Like Effect in Powdered Luminophores","authors":"N. Ter-Gabrielyan, V. Markushev, C. Briskina","doi":"10.1109/EQEC.1996.561839","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561839","url":null,"abstract":"It would be possible to develop purely chemical high power pulsed laser systems based on so called photon branchin chain reactions. In such type of reactions induced emission OF photons in the course of the chain reaction exceeds their expense to initiate the reaction. In our works a well-ar ued and fundamentally new way to bring about photon branc!in chain reactions, based on nonresonant interaction between I$ laser radiation and dispersed chemically actlve medja, has been advanced. It consists in introducing finely dispersed particles (e.g. passivated metal articles) into the active medium of HF or DF CO2 laser. TRe heating under the action of IR laser radiation causes the evaporation of particles and initiation of the chain reaction (Me t FZ = MeF t F). In this work we investi ated theoretically a ,pure chemical pulsed H2 F2 ampliyier with medium containing dis ersed particles of aluminium. We based on the authors’ own mul!ilevel model of HF laser allowed for the rotational nonequilibrium and anharmonicity of the HF molecules. Numerical calculations of chemical kinetics equations, vibrational relaxation e uations, heat balance e uation, equations for the temperature and radius of the aquminium particles subject t o evaporation in the HF laser field and the radiation transfer equations have been performed. We have found new dynamic regime of photon branching in dispersed medium of HF laser -wave re ime of the pro a ation of branchin chain reaction. In lhis regime efr%c?ive len t i ! h ? % the inpu? rlse absorption by dispersed particles is Par less than len t L of the HF amplifier. It was shown that output energy 07 the HZ F2 am lifier (L = 4 m) with the mixture pressure of 1 bar which utilizes aluminium particles with the concentration of &log cni’ and the diameter of 0.1 micrometers (h = 0.4 ml exceeds energy of the input radiation by 30 times. The ,research described in this publication was ,made ossible in part by Grant No.MXOOO from International Science F oundat ion. QThG20 Investigation of the Laser-like Effect in Powdered Luminophores","PeriodicalId":11780,"journal":{"name":"EQEC'96. 1996 European Quantum Electronic Conference","volume":"17 1","pages":"184-184"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75835503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}