Photorefractive Materials, Effects And Devices Prm'93最新文献

{"title":"Photorefractive materials, effects and devices topical meeting Kiev - 1993: A PHOTO ELECTRON PARAMAGNETIC RESONANCE STUDY OF VANADIUM DOPED HIGH RESISTIVE CdTe","authors":"J. Launay, H. J. von Bardeleben, V. Mazoyer","doi":"10.1364/pmed.1993.frh.1","DOIUrl":"https://doi.org/10.1364/pmed.1993.frh.1","url":null,"abstract":"The investigation of photorefractive semiconductors (s.c.) is strongly motivated by the compatibility of their operating wavelengths with s.c. lasers and optics fibers.","PeriodicalId":110649,"journal":{"name":"Photorefractive Materials, Effects And Devices Prm'93","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127733828","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":"Influence of Photoelasticity on Light Self Diffraction in Photorefractive Crystal of Bi12SiO20","authors":"A. Borshch, M. Brodin, V. Volkov, N. Kukhtarev, T. Semenets","doi":"10.1364/pmed.1993.thc.2","DOIUrl":"https://doi.org/10.1364/pmed.1993.thc.2","url":null,"abstract":"An essential role of photoelasticity in light, diffraction by volume gratings in photorefractive crystals was pointed out in [1] for CW lasers.","PeriodicalId":110649,"journal":{"name":"Photorefractive Materials, Effects And Devices Prm'93","volume":"33 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120931468","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":"Self-Pumped and Incoherent Phase Conjugation in Optical Communication Links","authors":"C. Medrano, M. Zgonik, N. Sonderer, P. Ginter","doi":"10.1364/pmed.1993.frd.8","DOIUrl":"https://doi.org/10.1364/pmed.1993.frd.8","url":null,"abstract":"Since the pioneer work of phase conjugation in photorefractive barium manate [1], many experiments have been performed and different configurations have been proposed in order to improve the obtained reflectivities.","PeriodicalId":110649,"journal":{"name":"Photorefractive Materials, Effects And Devices Prm'93","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120945978","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":"Holographic Data Storage Devices Implemented with Photorefractive Materials","authors":"L. Hesselink","doi":"10.1364/pmed.1993.thg.2","DOIUrl":"https://doi.org/10.1364/pmed.1993.thg.2","url":null,"abstract":"Summary not available","PeriodicalId":110649,"journal":{"name":"Photorefractive Materials, Effects And Devices Prm'93","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121550410","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":"Photorefractive Gratings in Planar Waveguides in Electro-Optic Cubic Crystals","authors":"Y. Salikaev, S. Shandarov","doi":"10.1364/pmed.1993.frc.14","DOIUrl":"https://doi.org/10.1364/pmed.1993.frc.14","url":null,"abstract":"The photorefractive gratings formation in planar waveguides has been described in Refs. 1-3. LiNb03 single crystal doped of the impurities Fe or Cu was used as substrate of photorefractive waveguides [4]. Photorefractive gratings formation in that waveguides is due to the photovoltaic effect.","PeriodicalId":110649,"journal":{"name":"Photorefractive Materials, Effects And Devices Prm'93","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126238044","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":"Photorefractive Effect in LEC Grown Heavily Doped n-GaAs at Picosecond DFWM","authors":"K. Jarašiūnas, G. Roosen","doi":"10.1364/pmed.1993.frc.1","DOIUrl":"https://doi.org/10.1364/pmed.1993.frc.1","url":null,"abstract":"Recently a light diffraction with photorefractive feature on transient picosecond grating in non-photorefractive geometry was observed in LEC grown semi-insulating GaAs /1/.","PeriodicalId":110649,"journal":{"name":"Photorefractive Materials, Effects And Devices Prm'93","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126581738","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 current excitation in photoconductive crystal by running intensity pattern","authors":"A. V. Dooghin, I. V. Goosev, B. Zel'dovich","doi":"10.1364/pmed.1993.frg.3","DOIUrl":"https://doi.org/10.1364/pmed.1993.frg.3","url":null,"abstract":"Techniques of measurement of stationary current [1] and ac photo-electro-motive forces [2] are used for investigations of space charge field amplitude and crystal parameters. We theoretically investigate new method of measurement of crystal parameters through the measurements of de current dependencies on the fringes velocity and the spatial period of interference pattern and carry out experimental measurements. Techniques of measurement of stationary current [1] and ac photo-electro-motive forces [2] are used for investigations of space charge field amplitude and crystal parameters. We theoretically investigate new method of measurement of crystal parameters through the measurements of de current dependencies on the fringes velocity and the spatial period of interference pattern and carry out experimental measurements. The analysis is given for case of small light modulation and restricted by one carrier and one donor level model. ` Let the crystal be illuminated by running intensity pattern where /θ is mean intensity,' |m| is contrast of light modulation, \u0000 q\u0000 is spatial frequency of interference pattern, □ is oscillation fre- · quency. Moving pattern gives rise to modulation of space charge field inside the crystal. The modulation is shifted with respect, to the intensity pattern due to nonzero response time. Distribution of carriers in conduction band has the form Characteristics used in . expressions C2), C3) are commonly adopted in literature (31. Those distributions is out of phase and therefore there is force acting on the carrier distribution. That force is reason why direct current flows through the 'crystal. Averaging of photocurrent density gives the term \u0000 I\u0000 that is proportional to contrast squared: \u0000 i\u0000 \u0000 2\u0000 \u0000 ^~ tn\u0000 2. for dependence of current density on the fringes velocity we obtain Delay parameter \u0000 x\u0000 indicates how fast the intensity pattern moves in comparison with the crystal response time. Function \u0000 ?xΛl + x\u0000 2\u0000 )\u0000 has extreme values ±1 for the delay parameter x = ±l, respectively, as shown on fig.1. Thus we come to the conclusion that the photocurrent readies its maximum value if phase shift between space charge grating and photocarriers distribution is equal to π/4, i.e optimal os- ci llatory frequency coincides with the inverse recording time. For investigation of dependencies of current density on the spatial frequency of intensity pattern we rewrite expression for current in next form The current \u0000 j\u0000 \u0000 c\u0000 = ε£c|m|2/C4τR) in expression C6) is maximum value of photocurrent which exists in PRC sample for given contrast without external electric field. Here \u0000 E\u0000 \u0000 c\u0000 \u0000 = kTq\u0000 \u0000 c\u0000 \u0000 /e\u0000 is largest hologram amplitude obtained in crystal under diffusion recording mechanism and \u0000 q\u0000 = Ce2AL/e£JcT)1/2 is Debye screening spatial frequency. Dependence of photocurrent on normalized spatial grating frequency \u0000 q/q\u0000 \u0000 c\u0000 \u0000 -\u0000 is shown on fig. 2. It has maximum at a spatial frequency \u0000 q\u0000 \u0000 õ\u0000 which is determined from the equatio","PeriodicalId":110649,"journal":{"name":"Photorefractive Materials, Effects And Devices Prm'93","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134201269","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":"Real-time holographic interferometer using the technique of phase-conjugation in BTO","authors":"A. Kiessling, R. Kowarschik, L. Wenke","doi":"10.1364/pmed.1993.sad.2","DOIUrl":"https://doi.org/10.1364/pmed.1993.sad.2","url":null,"abstract":"1 Introduction Recently, applications of phase-conjugation[1][23][4 in photorefractive crystals to interfer-ometrv have found considerable attention. In our experiments a stable self-referencing interferometer using the phase-conjugation was built with a BTO crystal in a four-wave mixing geometry. The second pump wave which works as reconstruction wave of the interferometer has been realized by a self-pumped phase-ronjugation process in BaTiO 3 crystal. The advantages of such arrangements are *distortion-free reconstruction wave aself-alignment of the reconstruction wave * real-time process * interferometric measurements of dynamic changes of the incident wave front In the following the realization of a real-time double-exposure interferometer based on a BTO crystal for storing the holograms and using a BaTiO 3 crystal to create the reconstruction wave is discussed.","PeriodicalId":110649,"journal":{"name":"Photorefractive Materials, Effects And Devices Prm'93","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134227273","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":"Noncoherent Phase Conjugation in Bi12 TiO20","authors":"M. P. Petrov, E. V. Mokrushina, A. V. Toropov, E. Mendes, D. Tentori","doi":"10.1364/pmed.1993.thc.6","DOIUrl":"https://doi.org/10.1364/pmed.1993.thc.6","url":null,"abstract":"A noncoherent scheme of wavefront conjugation is interesting not only from the scientific, but also from the practical point of view, because it ensures highly stab le and interference-free measurements.","PeriodicalId":110649,"journal":{"name":"Photorefractive Materials, Effects And Devices Prm'93","volume":"14 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133135591","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":"Photorefractive Beam Fanning and Spatial Coherence","authors":"H. Rehn, R. Kowarschik","doi":"10.1364/pmed.1993.thd.3","DOIUrl":"https://doi.org/10.1364/pmed.1993.thd.3","url":null,"abstract":"The photorefractive beam fanning effect in barium titanate has been investigated for a long time [1].","PeriodicalId":110649,"journal":{"name":"Photorefractive Materials, Effects And Devices Prm'93","volume":" 15","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133421094","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}