Fe∶LiNbO_3晶体中全息图的选择性擦除研究  

A Study on the Selective Erasure of Photorefractive Holograms in Fe∶LiNbO_3 Crystal

作　　者：周元林[1] 谢敬辉[1] 孙萍[1] 张颖[1] 徐玉恒[2] 徐悟生[2] 

机构地区：[1]北京理工大学信息科学技术学院光电工程系,北京100081 [2]哈尔滨工业大学应用化学系,黑龙江哈尔滨150001

出　　处：《北京理工大学学报》2003年第1期100-104,共5页Transactions of Beijing Institute of Technology

基　　金：国家"九七三"计划项目 ( G19990 330 )

摘　　要：研究选择性擦除的原理和方法 .针对铌酸锂晶体中定影全息图和未定影全息图的特点 ,介绍相应的选择性擦除的原理和在物光和参考光中引入π相位差的几种方法 .通过引入π相位差记录互补全息图 ,利用全息图及其互补全息图的非相干叠加 ,消除原全息图对晶体折射率的调制 ,从而实现对未定影全息图的选择性擦除 .实验中实现了在晶体中某一数据页面内部分数据的擦除 ,并从理论上对实验结果进行了分析 .The principle and method of selective erasure are proposed and discussed. Relevant theories of selective erasure are given according to the characters of fixed and unfixed photorefractive holograms. Some methods of introducing π phase shift light intensity patterns (with regard to that used for recording) are reported. By recording the complementary hologram leading to changes in complementary refractive indices, the process of selective erasure can be realized. At the same time, some experimental results are also demonstrated and analyses of the results are given.

关 键 词：FE:LINBO3晶体 全息图 兀相位差 铌酸锂晶体 折射率 选择性擦除 体全息存储 

分 类 号：TQ591[化学工程—精细化工]