掺杂钾钠铌酸锶钡光折变晶体的各向异性衍射  

ANISOTROPIC DIFFRACTION IN DOPED KNSBN PHOTOREFRACTIVE CRYSTAL

作　　者：边少平[1] 张景文[1] 许克彬[1] 姜全忠[2] 陈焕矗[2] 孙大亮[2] 

机构地区：[1]哈尔滨工业大学应用物理系,哈尔滨150006 [2]山东大学晶体材料研究所,济南250100

出　　处：《物理学报》1993年第4期681-689,T001,共10页Acta Physica Sinica

摘　　要：本文给出了关于光折变晶体各向异性衍射的二波耦合方程,还给出了三种分别掺Cu,Ce,Co的钨青铜结构系列单晶(厚度为0.6—0.8cm)钾钠铌酸锶钡(KNSBN)在He-Ne激光(λ=6328A)照射下产生的光致光栅衍射实验结果。根据二波耦合理论,解释了这三种光析变晶体的衍射图样分布。根据波矢图的分析得出结论:对于不同性(正或负)单轴晶体,只能存在一种各向异性衍射的圆环图样(e→o衍射或o→e衍射)。理论分析与实验基本符合。Two wave coupling equations on anisotropic diffraction in photorefractive crystal is deri-ved according to coupling wave theory. Phase gratig diffraction results of a He-Ne laser beam (λ= 632.8 nm) passing through tungsten bronze crystals KNSBN doped respectively Ca, Ce and Co are given. The anisotropic diffraction patterns of these three kinds of photorefractive crystals is formally analyzed using these coupling formulae. It is concluded that the anisotro-pic diffraction ring pattern will present in one of the two kinds of diffraction (e→o or o→e diffraction) for different (positive or negtive) unixial crystal. Theory analysis and experi-mental results agree fair by well.

关 键 词：光折变晶体 钾钠铌酸锶钡 衍射 

分 类 号：O734.1[理学—晶体学]