摘要
根据折射率椭球方程及双光轴晶体中光波的传播与偏振特性 ,分析双轴晶体在主平面内激光倍频相位匹配的特性与方法 ,导出光波在主平面内传播时倍频的相位失配关系 ;给出双轴晶体中容许相位匹配倍频的相位匹配角及混频的有效非线性系数deff的表达式。利用可相位匹配的类型、相位匹配角公式和有效非线性系数deff表达式的表 ,容易对任意一具体晶体在一给定波长求出实际能实现相位匹配的类型或偏振组合 ,算出相位匹配角 ,比较不同的相位匹配类型或偏振组合的有效非线性系数 ,选择最佳的相位匹配类型与方向。从相位失配关系可以计算晶体主平面内倍频的接收角。
Based on index ellipsoid equation and characteristics of optical wave propagation and polarization in a biaxial crystal, methods of the collinear phase matching (PM) permitted for frequency doubling in principal planes of biaxial crystals are discussed and analysed. The general expressions of the effective nonlinear coefficients d eff and phase mismatchs for all the allowed PMs are derived for all kinds of biaxial crystals. By using the Table, in which possible PM types or polarization combinations, respective PM angle formula and effective nonlinear coeficients are involved, realizable PM methods may be found and respective PM angles can be calculated. Finally effective nonlinear coeficients for allowed PMs can be compared and optimal PM types or directions can be selected easily.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2002年第10期1159-1164,共6页
Acta Optica Sinica
关键词
主平面
双轴晶体
倍频
相位失配
有效非线性系数
非线性光学
biaxial crystal
phase matching (PM) paramiter
phase mismatch
effective nonlinear (NL) coefficient