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

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Considerations on the Optimization and Relevant Characterization of Photorefractive Materials 光折变材料优化及相关表征的思考
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.ap7
J. Zielinger, M. Tapiero
{"title":"Considerations on the Optimization and Relevant Characterization of Photorefractive Materials","authors":"J. Zielinger, M. Tapiero","doi":"10.1364/pmed.1990.ap7","DOIUrl":"https://doi.org/10.1364/pmed.1990.ap7","url":null,"abstract":"Photorefractives are very versatile, attractive optoelectronic materials, having a wide range of possible applications. A variety of functions have been demonstrated on a laboratory basis, but so far, only very few of them have found widespread applications. One main reason for this failure seems to be that the preparation of components, with optimal and reliable relevant characteristics, comes up against a fundamental, more and more crucial problem: the lack of a systematic physical and physico-chemical characterization in parallel with optical studies and material processing.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"56 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":"121856518","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
Measurements of Photorefractive Properties in BaTiO3:Co BaTiO3:Co光折变特性的测量
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.a2
D. Rytz, B. Wechsler, M. H. Garrett, C. C. Nelson
{"title":"Measurements of Photorefractive Properties in BaTiO3:Co","authors":"D. Rytz, B. Wechsler, M. H. Garrett, C. C. Nelson","doi":"10.1364/pmed.1990.a2","DOIUrl":"https://doi.org/10.1364/pmed.1990.a2","url":null,"abstract":"In the past, the photorefractive properties of BaTiO3 crystals doped with chromium [1] and iron [2, 3] have been described. Iron impurities, present in nominally undoped .crystals at levels between 40 and 150 ppm, have been identified as the microscopic centers correlated with the photorefractive effect [4]. The observed photorefractive effect in high purity crystals, however, with an iron level claimed to be smaller than 0.3 ppm [3], has been interpreted as evidence for another photorefractive species in these samples. The exact role of transition metal dopants in photorefractive BaTiO3 is still unclear.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"2 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":"122719833","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
Absorption Modulation Under Hologram Formation in Photorefractive Materials 光折变材料全息图形成过程中的吸收调制
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.bp1
A. Knyazkov, M. N. Lobanov
{"title":"Absorption Modulation Under Hologram Formation in Photorefractive Materials","authors":"A. Knyazkov, M. N. Lobanov","doi":"10.1364/pmed.1990.bp1","DOIUrl":"https://doi.org/10.1364/pmed.1990.bp1","url":null,"abstract":"It has been found, that some photorefractive materials, such as GaAs and BaTiO3, exhibit an intensity dependence in the absorption coefficient and the presense of absorption component of hologram grating [1,2]. We have shown in our previous paper [3], that hologram formation in photorefractive media has an amplitude - - phase character due to spatial redistribution of absorptive centres. For analysis we have used a band model with one type of photoactive centres.","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":"133847927","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 recording mechanism of acoustic waves in crystals 声波在晶体中的光折变记录机制
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.bp7
T. Zelenskaya, E. Kovalenko, E.W. Padusova, L. Sharygina
{"title":"Photorefractive recording mechanism of acoustic waves in crystals","authors":"T. Zelenskaya, E. Kovalenko, E.W. Padusova, L. Sharygina","doi":"10.1364/pmed.1990.bp7","DOIUrl":"https://doi.org/10.1364/pmed.1990.bp7","url":null,"abstract":"Now some recording mechanisms of acoustic waves in crystals are known. Photorefractive mechanism, mechanism, connected with nonstationary photoconductivity under impulse radiation of the crystal and also mechanisms connected with nonlinear material equations [1-3] belong to them. Our experiments on recording of acoustic waves with the frequency of about 100 MHz under the radiation of LiNbO3 crystal with subnanosecond light impulses showed that in this case photorefractive mechanism of recording is the main one. On this condition the electrical fields of the recorded grid gets the value like that of electric field of acoustic wave in piezocrystal. As the value of the field is so high one must take into consideration the selfdifraction of the waves while examing the recording process [4]. In this work the recording kinetics of the acoustic waves in photorefractive crystals under the radiation by the ultrashort light impulses with repetition frequency equal to that of sound is considered.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"17 3 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":"134266330","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
Self-pulsating and moving fringe-patterns in the outputs of a mutually-pumped BaTiO3 相互泵浦BaTiO3输出中的自脉动和移动条纹图案
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.i7
P. Ye, Dadi Wang, Zhi-guo Zhang
{"title":"Self-pulsating and moving fringe-patterns in the outputs of a mutually-pumped BaTiO3","authors":"P. Ye, Dadi Wang, Zhi-guo Zhang","doi":"10.1364/pmed.1990.i7","DOIUrl":"https://doi.org/10.1364/pmed.1990.i7","url":null,"abstract":"Recently, much attention has been paid on a new type of phase conjugation in BaTiO3 in which two mutually incoherent beams pump each other to generate the respective phase-conjugate reflections. Since the double phase-conjugate mirror was discovered1, several mutually-pumped phase-conjugators have been proposed and demonstrated.2-4 We report here on a configuration for mutually-pumping in which both the PC reflections are seen to undergo regular self-pulsating and moving fringes appear both on the far-field patterns of the reflected outputs.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"32 2 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":"133726765","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
Mode Degradation by Photorefractive Damage in Planar Optical Waveguides 平面光波导中光折变损伤引起的模式退化
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.bp10
F. Jariego, F. Agulló-Lóoez
{"title":"Mode Degradation by Photorefractive Damage in Planar Optical Waveguides","authors":"F. Jariego, F. Agulló-Lóoez","doi":"10.1364/pmed.1990.bp10","DOIUrl":"https://doi.org/10.1364/pmed.1990.bp10","url":null,"abstract":"Electrooptic materials, particularly LiNbO3, are used to fabricate optical waveguides and a variety of integrated optics devices1. However, the performance of this devices is hampered by the light-induced change in refractive index which leads to mode degradation. This damage or photorefractive effect (PRE) has been extensively investigated2 for LiNbO3 and a number of experiments have dealt with mode degradation in waveguides3,4,5. However, the theoretical description of these phenomena is in a very preliminary and insatisfactory stage.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"255 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":"133460245","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
Effects of temperature on photoconductivity in n-type cubici Bi12SiO20 温度对n型立方Bi12SiO20光电性的影响
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.b9
J. Partanen, P. Nouchi, J. M. Cohen-Jonathan, R. Hellwarth
{"title":"Effects of temperature on photoconductivity in n-type cubici Bi12SiO20","authors":"J. Partanen, P. Nouchi, J. M. Cohen-Jonathan, R. Hellwarth","doi":"10.1364/pmed.1990.b9","DOIUrl":"https://doi.org/10.1364/pmed.1990.b9","url":null,"abstract":"In the only study to our knowledge of the photorefractive effect in n-type cubic Bi12SiO20 (n-BSO) at low temperatures (300 to 80 K), optical four-wave mixing via the photorefractive effect was found to decline over one order-of-magnitude as the temperature was lowered from ~ 300 K to below ~ 200 K.1 The mixing returned to normal upon warming. To better understand this unexpected result, we have undertaken both pulsed and dc photoconductivity studies at various temperatures on the same n-BSO crystal, called \"CT1\" (Crystal Technology, Inc., 1984), as well as on other n-BSO crystals. The photocurrent excited by a nanosecond or picosecond optical pulse is known to decay non-exponentially in time, with characteristic times in the nanosecond and microsecond regimes.2 In CT1 we see further long decay tails (~ seconds) at room temperature. However, in another n-BSO crystal called \"SU1\" (Sumitomo Corp., 1986), this long tail is essentially absent.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"4 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":"130156019","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
Phase Conjugate Resonators and Bistable Oscillations in BaTiO3 BaTiO3中的相位共轭谐振器和双稳振荡
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.ep1
P. Venkateswarlu, M. Dokhanian, P. C. Sekhar, H. Jagannath, M. George
{"title":"Phase Conjugate Resonators and Bistable Oscillations in BaTiO3","authors":"P. Venkateswarlu, M. Dokhanian, P. C. Sekhar, H. Jagannath, M. George","doi":"10.1364/pmed.1990.ep1","DOIUrl":"https://doi.org/10.1364/pmed.1990.ep1","url":null,"abstract":"Kwang and Yariv(1) used a single domain BaTiO3 crystal to form a ring passive phase conjugator (RPPC) and auxiliary resonators pumped by a multi-mode Ar+ laser at 4880Å. The auxiliary resonators were bistable. Jagannath et. Al(2) from this laboratory, reported the operation of a unidirectional ring resonator (UDRR) in addition to the RPPC and found bistability between the two. They also observed a linear passive phase conjugator (LPPC) which is bistable with the RPPC. It was found that auxiliary oxci nations between the crystal and a mirror are bistable separately with the UDRR and the LPPC.","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":"114108531","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
Mechanisms of photochromic and photorefractive effects in double doped LiNbO3 双掺杂LiNbO3的光致变色和光折变效应机理
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.f2
É. Vartanyan, R.S. Micaelyan, R. Hovsepyan, A. R. Pogosyan
{"title":"Mechanisms of photochromic and photorefractive effects in double doped LiNbO3","authors":"É. Vartanyan, R.S. Micaelyan, R. Hovsepyan, A. R. Pogosyan","doi":"10.1364/pmed.1990.f2","DOIUrl":"https://doi.org/10.1364/pmed.1990.f2","url":null,"abstract":"The Lithium niobate crystals doping is effective photo-induced crystals properties influence method. Therefor, this paper was devoted to experimental investigations of photorefractive and photochromic effects in lithium niobate crystals, doping with Fe: Mn, Fe: Cu, Fe9Ti and Fe: Hf impurity combinations. Separately doping with Fe, Cu, Ti, Hf crystals were used for comparison in experiments. The crystal absorbtion spectrums show, that the impurities interact in spite of small concentrations. Photorefractive sensibility determination was corried out with careful in this work.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"2017 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":"114905191","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 incoherent to coherent optical conversion with KNbO3 crystals KNbO3晶体的光折变非相干到相干光学转换
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.jp2
P. Amrhein, E. Voit, P. Günter
{"title":"Photorefractive incoherent to coherent optical conversion with KNbO3 crystals","authors":"P. Amrhein, E. Voit, P. Günter","doi":"10.1364/pmed.1990.jp2","DOIUrl":"https://doi.org/10.1364/pmed.1990.jp2","url":null,"abstract":"The high sensitivity of photorefractive materials is very convenient for real time holography and image processing. All optical spatial light modulators using the photorefractive effect have been proposed by different authors1,2,3. These devices can transfer incoherent images to coherent laser beams.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","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":"133436234","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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