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.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
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 )
