【摘要】 在对称性理论的基础上，导出了不同晶体结构类型、不同的表面和界面、不同的磁化强度Ｍ取向下的二阶非线性极化率χ（２）的形式．通过输入和输出光极化强度的合适组合，不同的二阶非线性极化率χ（２）可以通过表面ＳＨＧ技术来测量．更多还原

【Abstract】 Based on the symmetric theory, the expressions of the second order nonlinear susceptibilities at different crystal structures , different surfaces or interfaces and different magnetized directions are obtained. With appropriate combinations of input and output beam polarization, different elements of the nonlinear susceptibilities can be measured by surface SHG.更多还原