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Topical Meeting on Photorefractive Materials, Effects, and Devices II最新文献

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Optical Bistability of a Nematic Liquid Crystal with Photorefractively Amplified Feedback 具有光折射放大反馈的向列液晶的光学双稳性
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1989-04-01 DOI: 10.1080/00150198908211336
M. Ingold, J. Keller, G. Pauliat, P. Günter
{"title":"Optical Bistability of a Nematic Liquid Crystal with Photorefractively Amplified Feedback","authors":"M. Ingold, J. Keller, G. Pauliat, P. Günter","doi":"10.1080/00150198908211336","DOIUrl":"https://doi.org/10.1080/00150198908211336","url":null,"abstract":"Light induced changes of the refractive index in a nematic liquid crystal [1] and in a photorefractive crystal (KNbO3) [2] have been used to design an optically bistable device [3]. In the nematic liquid crystal (NLC) light can reorient biréfringent molecules. Therefore the NLC, placed between crossed polarizers, acts as an optically controlled gate. In the KNbO3 crystal photorefractive two-beam coupling is used for light amplification.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126544747","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}
引用次数: 4
Photochromic Effect in Bi12SiO20 Crystals Bi12SiO20晶体的光致变色效应
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.bp11
T. Panchenko, A. Kudzin
{"title":"Photochromic Effect in Bi12SiO20 Crystals","authors":"T. Panchenko, A. Kudzin","doi":"10.1364/pmed.1990.bp11","DOIUrl":"https://doi.org/10.1364/pmed.1990.bp11","url":null,"abstract":"The study of photochromic effect in pure and doped Bi12SiO20 (BSO) crystals is useful both as for science and so for application. In articles [1-3] the photochromic effect in BSO doped with Cr and Mn has been studied. However the mechanism of the light induced charge transfer and nature of impurities are not clear. In this study the results of optical spectra investigation for BSO crystals doped with Al,Ga, Cr,Mn and Fe ions and crystals with compositions slightly deviated from ideal stoichiometric proportion are presented.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","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":"121226609","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}
引用次数: 0
On the Temperature-Dependent Photorefractive Effects in BaTiO3 BaTiO3中温度相关光折变效应的研究
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.ap10
D. M. Blanchard, G. Brost, R. A. Motes
{"title":"On the Temperature-Dependent Photorefractive Effects in BaTiO3","authors":"D. M. Blanchard, G. Brost, R. A. Motes","doi":"10.1364/pmed.1990.ap10","DOIUrl":"https://doi.org/10.1364/pmed.1990.ap10","url":null,"abstract":"In a recent letter Rytz et al[1] reported results of two-wave mixing experiments performed on BaTiO3 crystals in the temperature range between 20° and 120°C. They observed a large decrease in the density of empty traps as well as a significant decrease in the response time at elevated temperatures. The physical mechanism for the observed effects was not well understood. In this paper we show that the temperature variation in the empty trap concentration is accounted for by secondary photorefractive centers and discuss the possible influence of these traps on the hole mobility.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"29 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":"127454299","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}
引用次数: 0
Nonequilibrium Charge Transfer and other Low-Temperature Photorefractive Effects 非平衡电荷转移和其他低温光折变效应
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.c5
D. Nolte, A. Glass
{"title":"Nonequilibrium Charge Transfer and other Low-Temperature Photorefractive Effects","authors":"D. Nolte, A. Glass","doi":"10.1364/pmed.1990.c5","DOIUrl":"https://doi.org/10.1364/pmed.1990.c5","url":null,"abstract":"A dramatic quenching of the photorefractive effect at low temperatures has been observed. We will also demonstrate that optical quenching in GaAs during four-wave mixing produces a direct modulation of the Fermi level in the material.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"58 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":"123721902","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}
引用次数: 0
Generation of pure torsional wave in Bi12GeO20 crystals Bi12GeO20晶体中纯扭波的产生
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.pd12
R. Gaglione, J. Launay, C. Lauban
{"title":"Generation of pure torsional wave in Bi12GeO20 crystals","authors":"R. Gaglione, J. Launay, C. Lauban","doi":"10.1364/pmed.1990.pd12","DOIUrl":"https://doi.org/10.1364/pmed.1990.pd12","url":null,"abstract":"Ultrasonic methods of material characterization usually employ α-Quartz crystals to create torsional vibrations1. The mode is not pure, and the crystals exhibit a low electromechanical coupling factor.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"32 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":"125372351","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}
引用次数: 0
Two Wave Mixing Using Dual Frequency Signals in BaTiO3 - Application to the Amplification of Microwave Signals BaTiO3中双频信号的两波混频——在微波信号放大中的应用
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.jp12
D. Dolfi, B. Forestier, B. Loiseaux, H. Rajbenbach, J. Huignard
{"title":"Two Wave Mixing Using Dual Frequency Signals in BaTiO3 - Application to the Amplification of Microwave Signals","authors":"D. Dolfi, B. Forestier, B. Loiseaux, H. Rajbenbach, J. Huignard","doi":"10.1364/pmed.1990.jp12","DOIUrl":"https://doi.org/10.1364/pmed.1990.jp12","url":null,"abstract":"We analyze and experimentally demonstrate a new two wave mixing interaction using dual frequency signal beams and its application to the amplification of microwave signals. A differential gain γΔ = 17 is obtained in BaTiO3 when the signal beam frequencies are separated by fO = 2.2 GHz.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"15 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":"114286922","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}
引用次数: 0
Defects in Undoped and Doped Bi12GeO20 未掺杂和掺杂Bi12GeO20的缺陷
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.a7
M. Tapiero, J. Gies, N. Benjelloun, J. Launay, J. Zielinger
{"title":"Defects in Undoped and Doped Bi12GeO20","authors":"M. Tapiero, J. Gies, N. Benjelloun, J. Launay, J. Zielinger","doi":"10.1364/pmed.1990.a7","DOIUrl":"https://doi.org/10.1364/pmed.1990.a7","url":null,"abstract":"Optimization of Bi12Ge O20 (BGO) for better photorefractive performance requires a systematic physico-chemical and physical characterization in parallel with material processing, investigation of photorefractive properties and implementation of nonlinear experiments. A main aspect is to analyze the effects of unintentional and intentional doping. We are concerned by the physical characterization of defects. To this end we use novel special thermal and optical spectroscopic methods (1). These survey techniques allow to probe the forbidden gap and to monitor changes in the nature and concentration of the species.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"23 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":"117098238","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}
引用次数: 0
Photorefraction Without the Electrooptic Effect 没有电光效应的光折射
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.i4
R. Pierce, R. Cudney, G. D. Bacher, J. Feinberg
{"title":"Photorefraction Without the Electrooptic Effect","authors":"R. Pierce, R. Cudney, G. D. Bacher, J. Feinberg","doi":"10.1364/pmed.1990.i4","DOIUrl":"https://doi.org/10.1364/pmed.1990.i4","url":null,"abstract":"Photorefractive crystals can couple optical beams in more than one way. In the usual photorefractive effect, light redistributes charge between empty and full trapping sites in the crystal. The electric field of the charge then alters the refractive index of the crystal by the electrooptic effect. However, the trapping sites themselves produce a variation in the local polarizability of the crystal. If the incident intensity pattern is periodic in space, then the resulting periodic redistribution of trapping sites will form a grating that can scatter light, even if the electrooptic effect is zero in the crystal. This \"trap\" grating is always 90° out of phase with the electrooptic grating, due to the spatial derivative in Gauss's law.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","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":"124593235","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}
引用次数: 0
The Amplification of an Amplitude Modulated Signal Beam Via Two-Wave Mixing in Photorefractive Media 光折变介质中两波混频对调幅信号光束的放大
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.jp11
D. Webb, L. Solymar
{"title":"The Amplification of an Amplitude Modulated Signal Beam Via Two-Wave Mixing in Photorefractive Media","authors":"D. Webb, L. Solymar","doi":"10.1364/pmed.1990.jp11","DOIUrl":"https://doi.org/10.1364/pmed.1990.jp11","url":null,"abstract":"Two-wave mixing in photorefractive media has been studied theoretically and experimentally by a number of researchers, and a wide range of prospective applications of the effect have been demonstrated or proposed. Recently, Hamel de Montchenault et al., have demonstrated the amplification of high frequency amplitude modulated signals via two-wave mixing in BSO.1,2 In this paper we develop a theoretical framework for the analysis of two-wave mixing with an amplitude modulated signal beam. Preliminary experimental confirmation of the theory is provided.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"1 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":"124240781","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}
引用次数: 0
Dynamic instabilities in the mutually pumped ‘bird-wing’ phase conjugator 相互泵浦“鸟翼”相位共轭器的动态不稳定性
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.ip4
S. James, G. Hussain, R. Eason
{"title":"Dynamic instabilities in the mutually pumped ‘bird-wing’ phase conjugator","authors":"S. James, G. Hussain, R. Eason","doi":"10.1364/pmed.1990.ip4","DOIUrl":"https://doi.org/10.1364/pmed.1990.ip4","url":null,"abstract":"Recently a novel class of phase conjugator, the Mutually Pumped Phase Conjugator (MPCC), has been demonstrated in which two simultaneous phase conjugate (PC) reflections are generated by the interaction of two mutually incoherent beams within a crystal of BaTiO3[1, 2, 3]. Currently there are three classes of MPCC distinguished by the number of total internal reflections within the crystal, two, one or none, as shown in fig.1.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"20 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114022992","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}
引用次数: 1
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