对于晶体c轴平行于入射面的实验配置, 观察到了掺杂钾钠铌酸锶钡(KNSBN)晶体在外加电场作用下的各向异性自衍射现象; 同时给出了包含光栅波矢空间分布和空间电荷场二阶分量作用的各向异性自衍射的耦合波方程及其数值解, 理论分析和实验结果都表明各向异性自衍射光来自于两束入射光的共同作用

Anisotropic self diffraction in doped KNSBN crystals has been observed when an external electric field is applied for the experimental configuration where the c axis is parallel to the incidence plane. The coupled wave equations and their numerical solutions including the space distribution of a grating vector and the second order space electric field are presented. Both theoretical analysis and experimental results show that the anisotropic self diffracted light arises from the contribution of both incident beams.