摘要
报道了一种新的非相干－相干光学转换方法，该方法是基于对介质中光致双折射的局部擦除．所用样品为一种含偶氮基侧链聚合物液晶薄膜，该液晶薄膜具有显著的光致双折射和永久光学存储特性．将样品放置在两块相互正交的偏振片之间，用线偏振光在样品中产生稳定的双折射，然后通过入射的非相干图象进行局部地擦除，相干图象由一束Ｈｅ－Ｎｅ激光读出．
A
new approach to incoherent to coherent optical conversion based on the erasing locally of the
photoinduced birefringence is reported.The employed sample is an azobenzene liquid
crystalline film,which possesses photoinduced birefringence of large magnitude and the
characteristic of long term optical storage.A steady birefringence is induced in the sample by
linearly polarized light and then erased locally by an incident incoherent image.The coherent
image is read from the film placed between two crossed polarizers with a He Ne laser
beam.The obtained coherent image is a negative replica of the incident scene.
出处
《光子学报》
EI
CAS
CSCD
1999年第3期214-217,共4页
Acta Photonica Sinica
基金
国家自然科学基金
关键词
非相干-相干
光学转换
双折射
聚合物
光存储
Incoherent to coherent optical conversion
Photoinduced birefringence,Azobenzene side chain
liquid crystalline
Optical memory
