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

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Time Resolved Investigation of Photorefractive Gratings in KNbO3 KNbO3光折变光栅的时间分辨研究
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.d5
I. Biaggio, M. Zgonik, P. Günter
{"title":"Time Resolved Investigation of Photorefractive Gratings in KNbO3","authors":"I. Biaggio, M. Zgonik, P. Günter","doi":"10.1364/pmed.1990.d5","DOIUrl":"https://doi.org/10.1364/pmed.1990.d5","url":null,"abstract":"Electrochemical reduction1 leads to faster recording and decay times in KNbO3 crystals. In the simplest model the only photorefractive centers considered are iron impurities in two valence states Fe2+ and Fe3+. Reduction of the crystals reduces a great majority of these impurities to the Fe2+ state and increases the electrical conductivity. In this work we study gratings written with short pulses in such crystals.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"10 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":"121990589","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
Enhanced Photorefractive Gain in the Bulk Semiconductors GaAs:EL2 and CdTe:V on a 5 psec Timescale 块体半导体GaAs:EL2和CdTe:V在5 psec时间尺度上的增强光折变增益
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.d4
A. Smirl, T. Boggess, W. Schroeder, T. S. Stark, D. Norwood, G. Valley
{"title":"Enhanced Photorefractive Gain in the Bulk Semiconductors GaAs:EL2 and CdTe:V on a 5 psec Timescale","authors":"A. Smirl, T. Boggess, W. Schroeder, T. S. Stark, D. Norwood, G. Valley","doi":"10.1364/pmed.1990.d4","DOIUrl":"https://doi.org/10.1364/pmed.1990.d4","url":null,"abstract":"Recently, we reported extensive measurements of the energy transfer, via the photo-refractive effect and transient energy transfer, in picosecond two-beam coupling experiments in semiinsulating GaAs:EL2.1 In that case, 30 psec pulses from an active-passive mode-locked and Q-switched Nd:YAG laser system were used to generate a grating with a period of 1.7 µm in the semiconductor. That experiment was conducted in a regime where the laser pulse duration is an order of magnitude larger than the time required for the electrons to diffuse one grating period in the conduction band. Under these conditions, the two-beam coupling geometry was successfully modelled using a numerical solution (with no free parameters) to the equations describing the freecarrier dynamics and nonlinear material response of GaAs:EL2 during the optical interaction. Similar agreement between the theory and experimental data was obtained for the doped semiconductors CdTe:V and InP:Fe.","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":"122124910","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 Application of Holographic Interferometry in Nondestructive Testing Technique 全息干涉测量在无损检测技术中的应用
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.jp8
G. Dovgalenko, V. M. Eskov-Soskovetz, V. M. Skorikov, J.P. Kargin, V. Volkov
{"title":"The Application of Holographic Interferometry in Nondestructive Testing Technique","authors":"G. Dovgalenko, V. M. Eskov-Soskovetz, V. M. Skorikov, J.P. Kargin, V. Volkov","doi":"10.1364/pmed.1990.jp8","DOIUrl":"https://doi.org/10.1364/pmed.1990.jp8","url":null,"abstract":"Application of photorefractive silverless materials (photorefractive crystals Bi12Ti O20), as media for holographic recording is of a considerable interest for researchers since it is possible to use them in real time systems of nondestructive technical control. Higher recording sensitivity of media Bi12Ti O20 which can be compared with the best silverincluding materials type Kodak -649 -F, together with reversibility (practically unlimited number of optical information record and readout cycles) make the given media sufficiently, prospective for various tasks of technical control. The authors represent the results of the application of the given media in the systems of Hybrid Optical Electron Complexes -HOEC, in which input, preliminary processing and output of information are optical, and the final information processing is performed by a computer.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"47 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":"125553484","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
Polarization and Dispersion of Light in the Anisotropic Fiber-Crystal System in Phase Conjugation 相位共轭各向异性光纤-晶体系统中光的偏振和色散
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.pd9
N.V. Kuchtarev, S. Lapaeva, A. Volyar
{"title":"Polarization and Dispersion of Light in the Anisotropic Fiber-Crystal System in Phase Conjugation","authors":"N.V. Kuchtarev, S. Lapaeva, A. Volyar","doi":"10.1364/pmed.1990.pd9","DOIUrl":"https://doi.org/10.1364/pmed.1990.pd9","url":null,"abstract":"Polarizing light characteristics have been researched theoretically and experimentally in the anisotropic-multimode fiber crystal system in phase conjugation. It has been shown that in multiple phase conjugation a mode dispersion may be completely compensated in an isotropic cylindrical fiber caused by polarizing phase conjugation pertubation. It has been obtained in a matching anisotrboic fiber-crystal LiNbO3 system it is possible to transmit polarized light with a given ellipticity value.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"37 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":"126524891","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
Optimization of DFWM in Crystals of the Sillenite-Family with Respect to the Polarization of the Signal- and Pump-Waves 硅辉石族晶体中基于信号波和泵浦波偏振的DFWM优化
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.bp5
A. Erdmann, R. Kowarschik, L. Wenke
{"title":"Optimization of DFWM in Crystals of the Sillenite-Family with Respect to the Polarization of the Signal- and Pump-Waves","authors":"A. Erdmann, R. Kowarschik, L. Wenke","doi":"10.1364/pmed.1990.bp5","DOIUrl":"https://doi.org/10.1364/pmed.1990.bp5","url":null,"abstract":"Over the last years degenerate four-wave mixing (DPWM) has been demonstrated to be a powerful technique to generate a phase conjugated wave. Among the materials used for DPWM the photorefractive crystals of the sillenite-family belong to the most sensitive ones. On the other hand, the anisotropic properties of these crystals result in a strong dependency of the intensity and the polarization state of the phase conjugated wave on the polarization states of the signal— and pump-waves, on the crystal geometry and thickness and on some other physical parameters.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"26 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":"125600869","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
High-Resolution Optical Novelty Filter Using Photorefractive GaAs And High-Speed Nematic Liquid Crystal Phase Modulator 采用光折变砷化镓和高速向列液晶相位调制器的高分辨率新型光学滤波器
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.jp1
Duncan T. H. Liu, Li-Jen Cheng, Shin‐Tson Wu
{"title":"High-Resolution Optical Novelty Filter Using Photorefractive GaAs And High-Speed Nematic Liquid Crystal Phase Modulator","authors":"Duncan T. H. Liu, Li-Jen Cheng, Shin‐Tson Wu","doi":"10.1364/pmed.1990.jp1","DOIUrl":"https://doi.org/10.1364/pmed.1990.jp1","url":null,"abstract":"Recently, optical novelty filters [1] have attracted much attention because of their potential applications in motion detection and optical tracking. Most optical novelty filters reported to date use BaTiO3 crystal as the needed nonlinear medium. In a previous report [2], we have shown that, owing to the shorter response time of GaAs, the output resolution of a GaAs based optical novelty filter is potentially much higher than that of a BaTiO3 based optical novelty filter. However, a relatively high-speed spatial phase modulator is needed for such an implementation. As a result, the usual nematic liquid crystal (NLC) modulators used in other implementations of optical novelty filter would respond too slow for the current implementation. Nevertheless, recently, the speed of NLC modulator has been greatly improved by various methods. For example, using the transient nematic effect, a frame time of less than 50 μs have been demonstrated [3]. Such a frame time is more than adequate for the current implementation. In this paper, we report the result of an investigation on the potential of building a high-resolution optical novelty filter using photorefractive GaAs and high-speed nematic liquid crystal phase modulator.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"42 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":"122378833","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
Application of High 2WM Gain in Photorefractive InP:Fe to IR Double Phase Conjugated Mirror 高2WM增益在光折变InP:Fe - IR双相位共轭镜中的应用
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.c4
P. Gravey, N. Wolffer, G. Picoli, C. Ozkul
{"title":"Application of High 2WM Gain in Photorefractive InP:Fe to IR Double Phase Conjugated Mirror","authors":"P. Gravey, N. Wolffer, G. Picoli, C. Ozkul","doi":"10.1364/pmed.1990.c4","DOIUrl":"https://doi.org/10.1364/pmed.1990.c4","url":null,"abstract":"The interest of Double Phase Conjugated Mirror1 (DPCM) for various optical interconnects schemes has been emphasized by several authors2,3,4 but experimental demonstrations were restricted to visible wavelengths. We present here high 2WM gain performances obtained at 1.06 and 1.32 µm with InP:Fe crystals grown at CNET LANNION and report on the observation of DPCM at 1.06 µm in the same material.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"57 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":"122289285","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
UV-Induced Refractive Index Changes in Germanosilicate Fibres 锗硅酸盐纤维紫外光诱导折射率的变化
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.f4
D. Hand, P. Russell, P. J. Wells
{"title":"UV-Induced Refractive Index Changes in Germanosilicate Fibres","authors":"D. Hand, P. Russell, P. J. Wells","doi":"10.1364/pmed.1990.f4","DOIUrl":"https://doi.org/10.1364/pmed.1990.f4","url":null,"abstract":"Photorefractivity in germanosilicate fibres was first reported by Hill and co-workers over a decade ago1. They were able to produce holographic gratings 60 cm long by interfering counterpropagating modes at 488 and 514.5 nm. Further measurements by Lam and Garside2 indicated that reflection efficiencies approached 100% for interaction lengths of l-2cm implying refractive index modulations of the order of 10-5. They were unable to estimate the spectral variation of the index change Δn(λ) because the reflection band was restricted to the recording wavelength. It is clear that, for distributed reflectors at communications wavelengths, the effect is only useful if i) a substantial index change, extends out to beyond 1 μm and ii) a satisfactory method of side-writing gratings can be found.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"40 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":"125681051","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
Optical Implementation of Perceptrons Using Photorefractive Media 使用光折变介质的感知器光学实现
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.h1
John H. Hong, S. Campbell, P. Yeh
{"title":"Optical Implementation of Perceptrons Using Photorefractive Media","authors":"John H. Hong, S. Campbell, P. Yeh","doi":"10.1364/pmed.1990.h1","DOIUrl":"https://doi.org/10.1364/pmed.1990.h1","url":null,"abstract":"While volume holograms offer a powerful means for providing interconnections for many information processing tasks, the adaptable interconnection capability necessary for implementing learning algorithms for neural networks finds an almost ideal realization in photorefractive crystals. The dynamic holograms in which gratings are built up in real time without the need for separate development cycles make them appealing for neural implementations [1-3]. This, coupled with the highly dense information storage capability that is inherent in volume holograms (e.g.,~1012 interconnections in ~1 cm3 [4]) make photorefractive implementations unique among many neural implementation technologies.","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":"133678270","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
Thin Epitaxial Films of Photorefractive Materials 光折变材料的外延薄膜
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.f3
M. Gower, N. Vainos, K. Youden, R. Eason
{"title":"Thin Epitaxial Films of Photorefractive Materials","authors":"M. Gower, N. Vainos, K. Youden, R. Eason","doi":"10.1364/pmed.1990.f3","DOIUrl":"https://doi.org/10.1364/pmed.1990.f3","url":null,"abstract":"Provided they can be satisfactorily fabricated, the use of thin films of photorefractive material as four wave mixing media for real time holographic application is an extremely attractive alternative to the use of the bulk crystal. For example, because guided wave intensities in the film can be very high-even when using lowered cw laser sources, the response time for holographic recording can be very fast. For example, ~100 mW of power coupled in a ~1 cm wide 1µm thick stripe of BaTiO3 film should reduce the response time from ~1 sec at 100 mW/cm2 in the bulk crystal to ~100 µsec in the film. Furthermore, with thin photorefractive films large area real time phase conjugate mirror operation with low powered laser sources can be contemplated.","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":"132073482","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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