Photorefractive Materials, Effects And Devices Prm'93最新文献_第9页

Dynamics of Selfdiffraction in Photorefractive Media 光折变介质中自衍射动力学

Photorefractive Materials, Effects And Devices Prm'93 Pub Date : 1900-01-01 DOI: 10.1364/pmed.1993.frd.7

T. Semenets

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Photo- and Electrochromic Effects in Undoped and Doped Bi12SiO20 Single Crystals 未掺杂和掺杂Bi12SiO20单晶的光致变色和电致变色效应

Photorefractive Materials, Effects And Devices Prm'93 Pub Date : 1900-01-01 DOI: 10.1364/pmed.1993.thc.11

T. Panchenko, N. A. Truseyeva, Yu. G. Osetsky

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Detection of transient motion of a scattering surface by two-wave mixing in GaAs crystal. 砷化镓晶体中两波混频散射表面瞬态运动的检测。

Photorefractive Materials, Effects And Devices Prm'93 Pub Date : 1900-01-01 DOI: 10.1364/pmed.1993.sad.4

A. Blouin, J. Monchalin

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Interband Photorefractive Effects in KNbO3 crystals KNbO3晶体的带间光折变效应

Photorefractive Materials, Effects And Devices Prm'93 Pub Date : 1900-01-01 DOI: 10.1364/pmed.1993.frf.1

G. Montemezzani, P. Rogin, M. Zgonik, P. Günter

{"title":"Interband Photorefractive Effects in KNbO3 crystals","authors":"G. Montemezzani, P. Rogin, M. Zgonik, P. Günter","doi":"10.1364/pmed.1993.frf.1","DOIUrl":"https://doi.org/10.1364/pmed.1993.frf.1","url":null,"abstract":"1. Introduction Photorefractive gratings are most often produced by illumination of an electro-optic crystal with laser light below the band gap and the absorbed photons induce photoexcitation and redistribution of carriers within mid-gap trap centers [11. The photorefractive response time is longer or equal to the time needed to photoexcite a large enough number of earners to create the space-charge field [2], To increase the speed of response, beside using higher light intensities, also a large absorption constant a of the crystal may be helpful. By doping, a can be increased only in a limited range. In contrast, large absorption constants are observed without doping at the band edge of any photorefractive material. In this region, the absorbed photons can induce interband phototransitions of electrons. The creation of photorefractive gratings by photoexcitation over the band gap has been demonstrated recently in multiple quantum well (MQW) devices [3-6]. However, the thickness of such multilayer structures is limited because of the epitaxial growth process and reasonable diffraction efficiencies are obtained only making use of resonant nonlinear effects at the band-edge. This limits the read-out wavelength range to a width of 10-20 nm and the optical interaction length to few µm. The use of oxide crystals with large linear electro-optic coefficients instead of MQW’s overcomes this problem because the read-out can be done at any wavelength in the visible or infrared. Even though the thickness of the photorefractive grating depends on the absorption constant and on the light intensity of the writing beams, the interaction length L can be increased to the crystal size by propagating the non-absorbed readout beams parallel to the crystal surface.","PeriodicalId":110649,"journal":{"name":"Photorefractive Materials, Effects And Devices Prm'93","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":"128610784","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}

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Energetic Spectrum Defects of Undoped and Al, Ga-Doped Bi12SiO20 Crystals 未掺杂和Al, ga掺杂Bi12SiO20晶体的能谱缺陷

Photorefractive Materials, Effects And Devices Prm'93 Pub Date : 1900-01-01 DOI: 10.1364/pmed.1993.thc.10

T. Panchenko, G. V. Snezhnoy

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Some Peculiarities Op Magnus Optical Effect in a Fiber/Crystal System by Polarization Information Translation 基于偏振信息平移的光纤/晶体系统中某些特殊的Op Magnus光效应

Photorefractive Materials, Effects And Devices Prm'93 Pub Date : 1900-01-01 DOI: 10.1364/pmed.1993.frh.4

T.V. Fadeeva, A. Volyar

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Photovoltaic and Photorefractive Ferroelectric Polymers 光电和光折变铁电聚合物

Photorefractive Materials, Effects And Devices Prm'93 Pub Date : 1900-01-01 DOI: 10.1364/pmed.1993.tha.2

K. Verkhovskaya, V. Fridkin, J. Legrand, A. Bune

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Anomalous Properties of Recording and Replay of x(2) Gratings in Glasses. 玻璃中x(2)光栅记录和重放的异常性质。

Photorefractive Materials, Effects And Devices Prm'93 Pub Date : 1900-01-01 DOI: 10.1364/pmed.1993.frh.5

M. Bolshtyansky, V. Churikov, A. Savchenko, B. Zel'dovich

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Ultraviolet photorefraction in LiNbO3 LiNbO3的紫外光折射

Photorefractive Materials, Effects And Devices Prm'93 Pub Date : 1900-01-01 DOI: 10.1364/pmed.1993.frf.2

R. Jungen, T. Engel, F. Laeri, T. Tschudi

{"title":"Ultraviolet photorefraction in LiNbO3","authors":"R. Jungen, T. Engel, F. Laeri, T. Tschudi","doi":"10.1364/pmed.1993.frf.2","DOIUrl":"https://doi.org/10.1364/pmed.1993.frf.2","url":null,"abstract":"INDRODUCTION Up to now the main interest in photorefraction is focused in the visible and recently in the infrared part of the spectrum. For certain application however, photorefraction in the UV seems of great promise. Only Fridkin et.al. [1] and Montemezzani et.al. [2] reported results in the Ultraviolet with KDP at deep temperatures and Bi4Ge3Oi2 at room temperature, respectively. Some years ago, Orlcwski et.al. [3 examined LiNbO3 and LiTO3 doped with transition metals in the UV. The hole conductivity was increased due to oxidization of the samples. Since hole conductivity does not contribute to the photovoltaic effect, diffusion became the dominant charge transport mechanism in strongly oxidized crystals. Very high absorption inhibited further sensible examinations. In a recent publication [5] we reported a small photovoltaic field of approx. 550 V/cm for nominally undoped LiNbO3- crystals with moderate absorption at 35lnm. The charge transport is dominated by diffusion of photoexcited holes. We extended our investigation to the spectral dependence of photoconductivity- and wave mixing- experiments. The unique results additionally make feasible self pumped phase conjugation with an external ring and self enhancement effects if beams are diffracted at fixed gratings. In all experiments extraordinary polarisation and grating vector parallel to the crystals c-axis were chosen . to address the largest electrooptical coefficient r33 in LiNbO3.","PeriodicalId":110649,"journal":{"name":"Photorefractive Materials, Effects And Devices Prm'93","volume":"54 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":"125430939","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}

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A New Threshold Effects in LiNbO3 :Mg. LiNbO3:Mg中一个新的阈值效应。

Photorefractive Materials, Effects And Devices Prm'93 Pub Date : 1900-01-01 DOI: 10.1364/pmed.1993.frh.3

I. M. Zaritskii, L. Rakitina, A. A. Konchits, G. Corradi, K. Polgár

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