Pub Date : 1996-06-07DOI: 10.1109/EQEC.1996.561656
D. Birkedal, Karim El, Hvam, Jørn Märcher
Summary form only given. We present an experimental and theoretical investigation of ultrafast transient four-wave mixing (TFWM) of GaAs-AlGaAs quantum wells for simultaneous excitation of exciton and continuum states. Recent TFWM experiments on semiconductors have shown unexpected results when both discrete exciton states and continuum states have been excited simultaneously by ultrafast laser pulses. The decay of the signal, as a function of delay, is significantly faster than the dephasing time of the excitons.
{"title":"Continuum contribution to excitonic four-wave mixing","authors":"D. Birkedal, Karim El, Hvam, Jørn Märcher","doi":"10.1109/EQEC.1996.561656","DOIUrl":"https://doi.org/10.1109/EQEC.1996.561656","url":null,"abstract":"Summary form only given. We present an experimental and theoretical investigation of ultrafast transient four-wave mixing (TFWM) of GaAs-AlGaAs quantum wells for simultaneous excitation of exciton and continuum states. Recent TFWM experiments on semiconductors have shown unexpected results when both discrete exciton states and continuum states have been excited simultaneously by ultrafast laser pulses. The decay of the signal, as a function of delay, is significantly faster than the dephasing time of the excitons.","PeriodicalId":21999,"journal":{"name":"Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84393817","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}
Pub Date : 1996-06-07DOI: 10.1142/S0217979297001581
E. Cornell, M. Anderson, J. Ensher, D. Jin, M. Matthews, C. Wieman
Summary form only given. We have observed Bose-Einstein condensation in a dilute vapor of rubidium atoms cooled to below 100 nanoKelvin. This was achieved by laser cooling and trapping followed by magnetic trapping and evaporative cooling.
{"title":"Bose-Einstein condensation in an ultracold gas","authors":"E. Cornell, M. Anderson, J. Ensher, D. Jin, M. Matthews, C. Wieman","doi":"10.1142/S0217979297001581","DOIUrl":"https://doi.org/10.1142/S0217979297001581","url":null,"abstract":"Summary form only given. We have observed Bose-Einstein condensation in a dilute vapor of rubidium atoms cooled to below 100 nanoKelvin. This was achieved by laser cooling and trapping followed by magnetic trapping and evaporative cooling.","PeriodicalId":21999,"journal":{"name":"Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87803213","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}
Pub Date : 1996-06-07DOI: 10.1007/978-94-009-0313-5_12
C. Cheng, A. Scherer, V. Arbet-Engels, E. Yablonovitch
{"title":"3-D photonic crystals operating at optical wavelengths","authors":"C. Cheng, A. Scherer, V. Arbet-Engels, E. Yablonovitch","doi":"10.1007/978-94-009-0313-5_12","DOIUrl":"https://doi.org/10.1007/978-94-009-0313-5_12","url":null,"abstract":"","PeriodicalId":21999,"journal":{"name":"Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77922308","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}
J. Levy, V. Nikitin, J. Kikkawa, D. Awschalom, N. Samarth
Summary form only given. A femtosecond-resolved low-temperature near-field scanning optical microscope (NSOM) is used to monitor the spatio-temporal evolution of excitonic spins in a magnetic semiconductor, ZnSe-ZnCdSe MBE-grown semiconductor quantum well structures that are laterally patterned.
{"title":"Femtosecond near-field spin microscopy to digital magnetic heterostructures","authors":"J. Levy, V. Nikitin, J. Kikkawa, D. Awschalom, N. Samarth","doi":"10.1063/1.362101","DOIUrl":"https://doi.org/10.1063/1.362101","url":null,"abstract":"Summary form only given. A femtosecond-resolved low-temperature near-field scanning optical microscope (NSOM) is used to monitor the spatio-temporal evolution of excitonic spins in a magnetic semiconductor, ZnSe-ZnCdSe MBE-grown semiconductor quantum well structures that are laterally patterned.","PeriodicalId":21999,"journal":{"name":"Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84543514","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}
C. Siders, S. P. Le Blanc, D. Fisher, T. Tajima, M. Downer, A. Babine, A. Stepanov, A. Sergeev
Summary form only given. The ability to measure plasma wave microstructure directly is important for addressing fundamental issues of wakefield generation and propagation. We report femtosecond time-resolved measurements of the longitudinal and radial structure of laser wakefield oscillations using an all optical technique known as photon acceleration.
{"title":"Laser wakefield excitation and measurement by femtosecond longitudinal interferometry","authors":"C. Siders, S. P. Le Blanc, D. Fisher, T. Tajima, M. Downer, A. Babine, A. Stepanov, A. Sergeev","doi":"10.2172/238564","DOIUrl":"https://doi.org/10.2172/238564","url":null,"abstract":"Summary form only given. The ability to measure plasma wave microstructure directly is important for addressing fundamental issues of wakefield generation and propagation. We report femtosecond time-resolved measurements of the longitudinal and radial structure of laser wakefield oscillations using an all optical technique known as photon acceleration.","PeriodicalId":21999,"journal":{"name":"Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87118476","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}
D. Christodoulides, S. R. Singh, M. I. Carvalho, M. Segev
Summary form only given. Recently it was demonstrated that spatial optical solitons at /spl mu/W power levels can be supported in photorefractive (PR) media. We show that a new type of incoherently coupled soliton pairs is possible under steady-state conditions provided that their carrier beams share the same polarization and wavelength and are mutually incoherent. They can be readily realized in a simple experimental setup where the optical beams co-propagate collinearly in a biased PR crystal in which case they experience equal electrooptic coefficients.
{"title":"Incoherently coupled soliton pairs in biased photorefractive crystals","authors":"D. Christodoulides, S. R. Singh, M. I. Carvalho, M. Segev","doi":"10.1063/1.116659","DOIUrl":"https://doi.org/10.1063/1.116659","url":null,"abstract":"Summary form only given. Recently it was demonstrated that spatial optical solitons at /spl mu/W power levels can be supported in photorefractive (PR) media. We show that a new type of incoherently coupled soliton pairs is possible under steady-state conditions provided that their carrier beams share the same polarization and wavelength and are mutually incoherent. They can be readily realized in a simple experimental setup where the optical beams co-propagate collinearly in a biased PR crystal in which case they experience equal electrooptic coefficients.","PeriodicalId":21999,"journal":{"name":"Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80641846","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}
Pub Date : 1996-01-01DOI: 10.1103/PhysRevA.56.3870
E. Constant, V. Taranukhin, A. Stolow, B.P. Corkum
Summary form only given. High harmonics are generated during the ionization of an atomic gas and therefore the probability of ionization, the number of unionized atoms, and the phase matching effects will impose a natural temporal envelope on the harmonic generation. We made some simulations which showed the maximal, minimal, and averaged possible values of the intensity of the harmonic as a function of the angular frequency detuning multiplied by the length of the harmonic pulse. From the envelope of the maximum signal we can extract the high harmonic pulse duration.
{"title":"Measurement of the duration of high harmonic pulses","authors":"E. Constant, V. Taranukhin, A. Stolow, B.P. Corkum","doi":"10.1103/PhysRevA.56.3870","DOIUrl":"https://doi.org/10.1103/PhysRevA.56.3870","url":null,"abstract":"Summary form only given. High harmonics are generated during the ionization of an atomic gas and therefore the probability of ionization, the number of unionized atoms, and the phase matching effects will impose a natural temporal envelope on the harmonic generation. We made some simulations which showed the maximal, minimal, and averaged possible values of the intensity of the harmonic as a function of the angular frequency detuning multiplied by the length of the harmonic pulse. From the envelope of the maximum signal we can extract the high harmonic pulse duration.","PeriodicalId":21999,"journal":{"name":"Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73441858","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}
Recent advances in near-field scanning optical microscopy (NSOM) make it possible to image single molecule emission with nanometric resolution and extend the single molecule spectroscopy work done at cryogenic temperature to the room temperature regime. With NSOM, molecular fluorescence can be spectrally and temporally resolved, allowing detailed studies of molecular interaction and dynamics on a single molecule basis with a spatial resolution beyond the diffraction limit.
{"title":"Near-field single molecule spectroscopy","authors":"Sunney Xie, P. Lu, R. Bian, E. Sanchez, P. Leung","doi":"10.1117/12.206436","DOIUrl":"https://doi.org/10.1117/12.206436","url":null,"abstract":"Recent advances in near-field scanning optical microscopy (NSOM) make it possible to image single molecule emission with nanometric resolution and extend the single molecule spectroscopy work done at cryogenic temperature to the room temperature regime. With NSOM, molecular fluorescence can be spectrally and temporally resolved, allowing detailed studies of molecular interaction and dynamics on a single molecule basis with a spatial resolution beyond the diffraction limit.","PeriodicalId":21999,"journal":{"name":"Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75921674","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}
Pub Date : 1900-01-01DOI: 10.1109/eqec.1996.561599
V. Aleshkin, L. Vorobjev, D. Donetsky, T. Dumelow, A. Kastalsky, O. Kuznetsov, G. Mirjalili, L. K. Orlov, T. J. Parker, S. Farjami Shayesteh
Summary form only given. The present work is a study of FIR emission from p-type GaAs-AlGaAs and Ge-GeSi structures caused by direct transitions of hot 2D holes between quantum-well subbands and modulation of FIR laser radiation under heating of 2D holes in quantum wells (QW). These phenomena were not observed before.
{"title":"Interaction of far-infrared radiation with hot two-dimensional holes in the quantum wells GaAs/Al/sub 1-x/Ga/sub x/As and Ge/Ge/sub 1-x/Si/sub x/","authors":"V. Aleshkin, L. Vorobjev, D. Donetsky, T. Dumelow, A. Kastalsky, O. Kuznetsov, G. Mirjalili, L. K. Orlov, T. J. Parker, S. Farjami Shayesteh","doi":"10.1109/eqec.1996.561599","DOIUrl":"https://doi.org/10.1109/eqec.1996.561599","url":null,"abstract":"Summary form only given. The present work is a study of FIR emission from p-type GaAs-AlGaAs and Ge-GeSi structures caused by direct transitions of hot 2D holes between quantum-well subbands and modulation of FIR laser radiation under heating of 2D holes in quantum wells (QW). These phenomena were not observed before.","PeriodicalId":21999,"journal":{"name":"Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78452481","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}
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