LiNbO_3晶体中光折变光栅的各向异性衍射  

The Anisotropic Diffraction of Photorefractive Gratings in LiNbO_3 Crystals

作　　者：王丽香[1] 陶世荃 陈孙征[1] 

机构地区：[1]北京工业大学应用物理系,北京100022

出　　处：《光电子．激光》2001年第7期664-666,共3页Journal of Optoelectronics·Laser

基　　金：国家重点基础科研基金 973资助项目 (G19990 3 3 0 ) ;国家自然科学基金资助项目 (6 99770 0 5 )

摘　　要：光折变晶体中光栅的各向异性衍射可用来提高光折变存储器读出信号的信噪比。本文通过极化率张量对 L i Nb O3 晶体中光栅形成和衍射的偏振特性进行了理论分析 ,并着重对光栅矢量与晶体光轴共面的情形进行了实验研究。Anisotropic diffraction of gratings in photorefractive crystals can be used to improve the signal to noise ratio of readout signals from photorefractive memories.In this paper the polarization properties of formation and diffraction of gratings in LiNbO 3 crystal are analyzed based on the susceptibility tensor and the effective electrooptic coefficients.Experiments on the case when the caxis is coplanar with the grating vectors are conducted,showing that the anisotropic diffraction is obvious and the measurement of readout angle for anisotropic diffraction is agreed with theoretical calculation.

关 键 词：各向异性衍射 LINBO3晶体 光折变效应 光折变晶体 光栅 

分 类 号：TN253[电子电信—物理电子学] O734[理学—晶体学]