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

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Magnetic Circular Dichroism and Circular Dichroism of Doped Bi12GeO20 Crystals 掺杂Bi12GeO20晶体的磁性圆二色性和圆二色性
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.bp2
B. Briat, C. Laulan, J. Launay, J. Badoz
{"title":"Magnetic Circular Dichroism and Circular Dichroism of Doped Bi12GeO20 Crystals","authors":"B. Briat, C. Laulan, J. Launay, J. Badoz","doi":"10.1364/pmed.1990.bp2","DOIUrl":"https://doi.org/10.1364/pmed.1990.bp2","url":null,"abstract":"Crystals with the sellenite structure are used widely in various technical devices because they exhibit photochromie, piezoelectric, electrooptic or else magnetooptic effects. They are also photoconductive and eventually photo- or thermoluminescent.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"70 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132434393","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
Photorefractive charge migration in BSO: A comparison of the band transport and hopping models BSO中的光折变电荷迁移:带输运和跳变模型的比较
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.bp9
M. Krainak
{"title":"Photorefractive charge migration in BSO: A comparison of the band transport and hopping models","authors":"M. Krainak","doi":"10.1364/pmed.1990.bp9","DOIUrl":"https://doi.org/10.1364/pmed.1990.bp9","url":null,"abstract":"There is a continued interest in the charge transport mechanism for the photorefractive effect, particularly in the sillenites (BSO, BGO, BTO)1,2. There are two prevalent models for the photoexcited charge migration, namely, the band transport theory and the hopping model3. In this paper we present a detailed comparison of the hopping and band transport models. We place the hopping model in the same framework as the band transport model. The hopping model is then modified to include an external electric field dependent time constant. This allows the development of an expression for the total electric space charge field for the condidtion of an externally applied alternating electric field. This expression is used in the electromagnetic coupled wave theory to predict the two wave mixing gain. Experimental and theoretical results are then compared. AC photoconductivity experimental results and theoretical predictions are also presented and compared.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"141 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":"122065281","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
Origin of Sublinear Photrefractive Effects in Barium Titanate 钛酸钡亚线性光折射效应的起源
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.b5
G. Brost, R. A. Motes
{"title":"Origin of Sublinear Photrefractive Effects in Barium Titanate","authors":"G. Brost, R. A. Motes","doi":"10.1364/pmed.1990.b5","DOIUrl":"https://doi.org/10.1364/pmed.1990.b5","url":null,"abstract":"The band-transport model of Kukhtarev [1] is commonly used to describe the photorefractive grating formation. According to this model the grating formation time should be inversely proportional to the laser intensity. However, experiments performed on barium titanate have shown a response time which has varied with intensity as I−x, where the exponential factor x has ranged from 0.5 to 1.0.[2] In this paper we show by computer modeling of the grating formation that the sublinear dependence of the response time is accounted for by the presence of secondary photorefractive centers.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"77 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":"133691150","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 Growth of BaTiO3 Crystals and The Research on Crystal Defects of Them by Electro-microscope Technique BaTiO3晶体的生长及其晶体缺陷的电镜研究
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.a4
Wu Xing, Zhu Yong, Zhang Daofang, Yang Cuiying
{"title":"The Growth of BaTiO3 Crystals and The Research on Crystal Defects of Them by Electro-microscope Technique","authors":"Wu Xing, Zhu Yong, Zhang Daofang, Yang Cuiying","doi":"10.1364/pmed.1990.a4","DOIUrl":"https://doi.org/10.1364/pmed.1990.a4","url":null,"abstract":"BaTiO3 crystals are very useful as an excellent photorefractive materials. But the growth of BaTiO3 crystals is very difficult due to some special chemical and physical properties of them. The BaTiO3 crystals in good optical quality have been grown successfully by Top Seed Solution Growth (TSSG) technique but the crystal defects happened easyly due to the unsuitable in the crystal growth conditions even just a little. The temperature distribution near the crystal growth front, the suitable seeding temperature, stabilyty of the growth interface and so on are very important to keep the crystal growth well and in good optical quality. All of these main conditions for growing of crystals were researched detailly in our experiments and discussed detailly in this paper.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"27 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":"122306346","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
Energy Transfer between Speckle-Waves in Photorefractive Crystals 光折变晶体中散斑波之间的能量传递
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.j5
A. V. Mamaev, V. Shkunov
{"title":"Energy Transfer between Speckle-Waves in Photorefractive Crystals","authors":"A. V. Mamaev, V. Shkunov","doi":"10.1364/pmed.1990.j5","DOIUrl":"https://doi.org/10.1364/pmed.1990.j5","url":null,"abstract":"Theoretical and experimental results on two-waves mixing with speckle-beams in photorefractive crystals are presented.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"26 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":"126050669","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
Contrast Manipulation and Controllable Spatial Filtering Via Photorefractive Four Wave Mixing and Two-Beam Coupling 利用光折变四波混频和双光束耦合实现对比度操纵和可控空间滤波
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.jp6
G. Hussain, R. Eason, J. Khoury
{"title":"Contrast Manipulation and Controllable Spatial Filtering Via Photorefractive Four Wave Mixing and Two-Beam Coupling","authors":"G. Hussain, R. Eason, J. Khoury","doi":"10.1364/pmed.1990.jp6","DOIUrl":"https://doi.org/10.1364/pmed.1990.jp6","url":null,"abstract":"Spatial filtering, which relies on the insertion of masks, slits or other objects such as stops in the Fourier transform plane of an optical imaging system, is a well established technique for optical image processing, These conventional methods, however, suffer from serious drawbacks such as the possibility of updating or renewing these Fourier masks at the speeds required for real-time processing.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"115 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":"122889394","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 Photorefractive Interconnects With Analog Weights 具有模拟权重的动态光折变互连
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.h2
A. Marrakchi, W. Hubbard, J. S. Patel
{"title":"Dynamic Photorefractive Interconnects With Analog Weights","authors":"A. Marrakchi, W. Hubbard, J. S. Patel","doi":"10.1364/pmed.1990.h2","DOIUrl":"https://doi.org/10.1364/pmed.1990.h2","url":null,"abstract":"Multiplexing of holographic gratings has potential application in the implementation of optical interconnects betweeen individual processing elements (or neurons) of two distinct planes in a neural network. Therefore, the capability of continuously modifying a given strength (or weight) without affecting the others is a critical issue. In this paper, we analyze grating erasure in photorefractive materials for the realization of interconnects with analog weights. The effects of both intensity and phase modulation of the writing beams on the diffraction efficiency and on the response time are considered. The phase modulation analysis includes the double-exposure and time-average techniques. Some insight on the limiting factors to the storage capacity which ultimately determines the number of possible interconnections are also given. Finally, preliminary results of an interconnect system that utilizes fast liquid crystal modulators are described.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"8 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":"134148248","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
Characterization of Cooper Doped BGO Application to Double Phase Conjugate Mirror 铜掺杂BGO在双相共轭镜中的应用
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.a9
N. Wolffer, P. Gravey, J. Moisan, C. Laulan, J. Launay
{"title":"Characterization of Cooper Doped BGO Application to Double Phase Conjugate Mirror","authors":"N. Wolffer, P. Gravey, J. Moisan, C. Laulan, J. Launay","doi":"10.1364/pmed.1990.a9","DOIUrl":"https://doi.org/10.1364/pmed.1990.a9","url":null,"abstract":"In order to improve the properties of photorefractive (PR) sillenite crystals, different dopants are currently being investigated. In this paper, we present some of the characteristics of two cooper doped Bi12GeO20 (BGO) crystals.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"78 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":"124848053","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
Photorefractive Properties of Iron and Manganese Doped Bi4Ge3O12 Single Crystals 铁锰掺杂Bi4Ge3O12单晶的光折变特性
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.ap4
L. Kovács, E. Moya, K. Polgár, C. Zaldo
{"title":"Photorefractive Properties of Iron and Manganese Doped Bi4Ge3O12 Single Crystals","authors":"L. Kovács, E. Moya, K. Polgár, C. Zaldo","doi":"10.1364/pmed.1990.ap4","DOIUrl":"https://doi.org/10.1364/pmed.1990.ap4","url":null,"abstract":"We report first results on the optical absorption, photoconductivity and visible photorefractive properties of Bi4Ge3O12 crystals doped with Fe and Mn. Optical absorption and photoconductivity response covers the visible and ultraviolet up to about 4.0 eV. The writting and erasure regimenes have been found complex. The origin of the gratings is discussed and calculations of several material parameters are reported.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"21 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":"122819879","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
Spectroscopy of photorefractive centres in Bi12SiO20 Bi12SiO20光折变中心的光谱学研究
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.b2
J. Baquedano, J. M. Cabrera
{"title":"Spectroscopy of photorefractive centres in Bi12SiO20","authors":"J. Baquedano, J. M. Cabrera","doi":"10.1364/pmed.1990.b2","DOIUrl":"https://doi.org/10.1364/pmed.1990.b2","url":null,"abstract":"The spectroscopy of several centres in Bi12SiO20 which are related to its photorefractive behaviour will be presented and discussed. In a recent paper, the spectral dependence of the photorefractive erasure by using the holographic method has been studied [1]. Two major absorption bands producing photorefractive erasure were found, their peak positions and halfwidths respectively being 2.7 eV (0.27 eV) and 3.1 eV (0.4 eV). These bands were obtained by numerically fitting the experimental decay constants for each erasing wavelength to those predicted by a two centre model [2] in which fast carrier exchange between the two traps was assumed. Because of practical reasons related with the fitting process, the geometrical shadow effect (sample selfabsorption) was not taken into account in that paper. Therefore the band parameters obtained from photorefractive erasure are necessarily a first approximation which should be improved with other measurements. In this paper, an analysis of the optical absorption and photoconductivity spectra based in those gaussian components is presented. This analysis is expected to provide a more detailed knowledge of the bands responsible for the optical absorption, photoconductivity and photorefractiorn, although the actual nature of the centres originating the bands remains uncertain. Photochromic effects induced on these bands by low temperature illumination, as well as their thermal annealing, will be also considered.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"80 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120886999","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
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