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

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Conjugation of Mutually-Incoherent Light Beams in the Geometry of Two Interconnected Ring Mirrors 相互不相干光束在两个相互连接的环形反射镜几何中的共轭
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1991-07-01 DOI: 10.1364/JOSAB.8.001447
A. V. Mamaev, A. Zozulya
{"title":"Conjugation of Mutually-Incoherent Light Beams in the Geometry of Two Interconnected Ring Mirrors","authors":"A. V. Mamaev, A. Zozulya","doi":"10.1364/JOSAB.8.001447","DOIUrl":"https://doi.org/10.1364/JOSAB.8.001447","url":null,"abstract":"New geometry for conjugation of mutually-incoherent light beams in photorefractive media is proposed. This geometry is realized experimentally and its theoretical description is given. Comparison between theory and experiment is made.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121921875","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: 7
Dynamic Holography Effects in Ferroelectrics Induced by Spatially-Oscillating Photovoltaic Currents 空间振荡光伏电流诱导铁电体的动态全息效应
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1991-06-01 DOI: 10.1364/JOSAB.8.001333
B. Sturman
{"title":"Dynamic Holography Effects in Ferroelectrics Induced by Spatially-Oscillating Photovoltaic Currents","authors":"B. Sturman","doi":"10.1364/JOSAB.8.001333","DOIUrl":"https://doi.org/10.1364/JOSAB.8.001333","url":null,"abstract":"It’s well known that the main mechanisms of holographic grating formation in photorefractive crystals are the diffusion of carriers, their drift in the electric field, and the photovoltaic effect (PVE). We shall concentrate on the last mechanism. It’s often supposed that the PVE in ferroelectrics can be characterized by the current along the polar \u0000c→-axis, j=α G I, where α is the absorption coefficient, G: the Glass coefficient, I: the light intensity. In this case, the PVE effect is analogous to the effect of supplementary electric field E\u0000 ph\u0000 =j(σ\u0000 d\u0000 +σ\u0000 ph\u0000 )−\u0000 1\u0000 , where σ\u0000 d\u0000 , σ\u0000 ph\u0000 are dark- and photoconductivity. The photoinduced field E\u0000 ph\u0000 reaohes 10\u0000 5\u0000 v/cm in LiNbO3 and LiTaO3. However, the effect of the PVE does not come to longitudinal current.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130124214","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: 11
Light Diffraction by Holographic Gratings in Optically Active Photorefractive Piezocrystals 光学主动光折变压电晶体中全息光栅的光衍射
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1990-10-01 DOI: 10.1080/00150199008008919
V. Shepelevich, S. Shandarov, A. Mandel’
{"title":"Light Diffraction by Holographic Gratings in Optically Active Photorefractive Piezocrystals","authors":"V. Shepelevich, S. Shandarov, A. Mandel’","doi":"10.1080/00150199008008919","DOIUrl":"https://doi.org/10.1080/00150199008008919","url":null,"abstract":"A number of cubic photorefractive crystals (CPC) have piezoelectric properties and natural gyrotropy simultaneously. It is known 1−3 that while recording holographic gratings (HG) in photorefractive piezocrystals there has been existed the secondary contribution to the disturbances of optical properties of the medium. It depends on joint action of piezoelectric and photoelastic effects. The secondary contribution can be taken into account by introducing effective electrooptic constants r'mnp 1−3. The account of gyrotropic properties of CPC in terms of approximation of coupled waves for arbitrary orientation of the grating vector k in the plane (110) has been carried out in the paper4.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"173 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127233791","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: 42
Net Gain in Photorefractive InP:Fe at λ = 1.32 µm Without an Applied Field 光折变InP:Fe在λ = 1.32µm时的净增益
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1990-09-03 DOI: 10.1063/1.103522
J. Strait, J. D. Reed, A. Saunders, G. Valley, M. Klein
{"title":"Net Gain in Photorefractive InP:Fe at λ = 1.32 µm Without an Applied Field","authors":"J. Strait, J. D. Reed, A. Saunders, G. Valley, M. Klein","doi":"10.1063/1.103522","DOIUrl":"https://doi.org/10.1063/1.103522","url":null,"abstract":"Gain is one of the most attractive aspects of the photorefractive effect. Phase conjugators and other applications become possible when photorefractive gain exceeds absorption losses. Semiconductors, such as InP and GaAs, have small electro-optic coefficients, so it has been necessary to apply electric fields of several kV/cm to realize large gains. In InP:Fe, a gain of 3 cm-1 first was reported with a 10 kV/cm AC applied field1 and later a gain of 4 cm-1 was obtained with an 8 kV/cm DC field.2 Recently gains as large as 6 cm-1 have been reported for an 8 kV/cm DC field.3 While it is not possible to have such large gains in InP:Fe without an applied field, the high voltages required are not practical for device applications.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133724579","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: 9
Photorefractivity at 1.5 μm in CdTe:V CdTe:V中1.5 μm的光折射率
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1990-08-27 DOI: 10.1063/1.103409
A. Partovi, J. Millerd, E. Garmire, M. Ziari, W. Steier, S. Trivedi, M. Klein
{"title":"Photorefractivity at 1.5 μm in CdTe:V","authors":"A. Partovi, J. Millerd, E. Garmire, M. Ziari, W. Steier, S. Trivedi, M. Klein","doi":"10.1063/1.103409","DOIUrl":"https://doi.org/10.1063/1.103409","url":null,"abstract":"CdTe is the least studied of the photorefractive semiconductors known to date (GaAs, InP, and CdTe). This is somewhat surprising considering that the electrooptic coefficient of CdTe is almost four times larger than that of GaAs and InP. CdTe is also one of the most sensitive photorefractive media available. Its photorefractive figure of merit for sensitivity (index change per absorbed photon), n3r41/εr is 2.5 times that of GaAs.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125034413","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: 127
Shallow Traps Resolve the IX Mystery in Photorefractive Barium Titanate 浅阱解决光折变钛酸钡IX之谜
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1990-05-21 DOI: 10.1364/pmed.1990.b6
D. Mahgerefteh, J. Feinberg
{"title":"Shallow Traps Resolve the IX Mystery in Photorefractive Barium Titanate","authors":"D. Mahgerefteh, J. Feinberg","doi":"10.1364/pmed.1990.b6","DOIUrl":"https://doi.org/10.1364/pmed.1990.b6","url":null,"abstract":"In 1984 Ducharme and Feinberg1 showed that the speed of the photorefractive effect in barium titanate was not a linear function of the light intensity I, but varied instead as Ix, with x < 1. This sublinear dependence prevailed over four orders of the light intensity ( 0.01 Watt/cm2 <I < 100 Watt/cm2 ). They also showed that the power x increased with increasing temperature. In 1988, Mahgerefteh and Feinberg2 showed that the speed of the photorefractive effect in barium titanate obeyed the same Ix power law for the case of pulsed illumination as well as for cw illumination, even though the peak intensities used in the pulsed case were 104 times that of the cw experiments. This result suggested that the Ix power law was valid for a range spanning eight orders of magnitude in the light intensity.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128342740","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
Measurement of Electro-Optic and Electrogyratory Effects in BTO (Bi12TiO20) BTO (Bi12TiO20)中电光和电旋效应的测量
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1990-03-01 DOI: 10.1063/1.345539
J. Wilde, L. Hesselink, S. McCahon, M. Klein, D. Rytz, B. Wechsler
{"title":"Measurement of Electro-Optic and Electrogyratory Effects in BTO (Bi12TiO20)","authors":"J. Wilde, L. Hesselink, S. McCahon, M. Klein, D. Rytz, B. Wechsler","doi":"10.1063/1.345539","DOIUrl":"https://doi.org/10.1063/1.345539","url":null,"abstract":"One group of promising photorefractive materials is the sillenites, which include Bi12SiO20 (BSO), Bi12GeO20 (BGO) and Bi12TiO20 (BTO). These materials are cubic, noncentrosymmetric and optically active. Although BTO shares a common structure with BSO and BGO, it has several advantages over the latter materials for photorefractive applications, including smaller optical activity, larger electro-optic coefficient and improved sensitivity in the red spectral region.1","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130509883","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: 35
Mobility-lifetime product of photoexcited electrons in GaAs 砷化镓中光激发电子的迁移寿命积
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1990-01-22 DOI: 10.1063/1.102786
G. Valley, H. Rajbenbach, H. Bardeleben
{"title":"Mobility-lifetime product of photoexcited electrons in GaAs","authors":"G. Valley, H. Rajbenbach, H. Bardeleben","doi":"10.1063/1.102786","DOIUrl":"https://doi.org/10.1063/1.102786","url":null,"abstract":"Application of large DC and AC fields to undoped semi-insulating GaAs to enhance its photorefractive performance leads to improvement compared to no applied field, but the improvement is not nearly as large as predicted theoretically when zero-field values of the mobility-lifetime product are used in the calculations. For example, Fig. 1 shows the gain coefficient as a function of grating period when an AC electric field is applied to the sample.1 The dashed lines are theoretical predictions based on a mobility of 5000 cm2/V-sec (from the Hall mobility of an adjacent sample) and a carrier lifetime of 30 nanoseconds (based on literature values for the recombination cross section of electrons to the EL2* level2). The solid lines are based on a mobility lifetime product four orders of magnitude smaller.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125096313","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: 20
The Multiplexed Storage of Permanent and Real-Time Holograms in Photorefractive BSO for Use in Image Processing and Spatial Light Modulation 用于图像处理和空间光调制的光折变BSO永久和实时全息图的多路存储
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1989-09-01 DOI: 10.1364/pmed.1990.jp7
S. Clapham, R. Eason
{"title":"The Multiplexed Storage of Permanent and Real-Time Holograms in Photorefractive BSO for Use in Image Processing and Spatial Light Modulation","authors":"S. Clapham, R. Eason","doi":"10.1364/pmed.1990.jp7","DOIUrl":"https://doi.org/10.1364/pmed.1990.jp7","url":null,"abstract":"In this paper we present a technique for storing holograms in crystals of bismuth silicon oxide (BSO) that combines reversible photochromic effects with the more usual real-time photorefractive characteristics. Photochromic effects have been observed before in these sillenite crystals [1] but have generally been considered as a problem rather than as a possible mechanism for holographic storage. As the normal photorefractive (PR) behaviour is unaffected, however, simultaneous spatial multiplexing of both photorefractive (real-time) and photochromic (permanent) holograms is possible in the same crystal volume.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120961049","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
Quasi-Nondestructive Readout of Holographically Stored Information in Photorefractive Bi12SiO20 Crystals 光折变Bi12SiO20晶体全息存储信息的准无损读出
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1989-08-21 DOI: 10.1063/1.102441
A. Delboulbé, C. Fromont, J. Herriau, S. Mallick, J. Huignard
{"title":"Quasi-Nondestructive Readout of Holographically Stored Information in Photorefractive Bi12SiO20 Crystals","authors":"A. Delboulbé, C. Fromont, J. Herriau, S. Mallick, J. Huignard","doi":"10.1063/1.102441","DOIUrl":"https://doi.org/10.1063/1.102441","url":null,"abstract":"We report the existence of a room temperature hologram fixing process in certain Bi12SiO2 (BSO) crystals, which appears to be due to the formation of a complementary grating of positive charges that compensates the photo-induced electronic space-charge field(1,2). Uniform illumination of the crystal with green light, in presence of an external D.C. electric field, erases the deep-level electronic charge pattern and reveals the positive charge grating which then decays with its own characteristic decay time. We believe, in agreement with the work of Strohkendl(3), that the hole charge pattern involves shallow traps. Since these traps can be thermally activated, the decay time constant can be further increased significantly by lowering the crystal temperature.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126048311","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: 31
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