非相干-相干光学转换新方法

报导了一种新的非相干 -相干光学转换方法 ,该方法是基于对介质中光致各向异性的局部擦除 样品放置在两个相互正交的偏振片之间 ,用线偏振的泵浦光在样品中产生稳定的双折射 ,然后通过入射非相干图象光进行局部擦除 ,相干图象由一束He -Ne激光读出 所得相干图象为输入非相干图象的负片 利用偶氮侧链液晶聚合物薄膜样品实现了图象的非相干 -相干光学转换

A New Method of Incoherent-to-Coherent Optical Conversion

A new approach to incoherent-to-coherent optical conversion based on the erasing locally of the photo-induced 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.