2～4μm可调谐OPO参量允差的数值分析

Numerical analyses of the allowed parametrical errors in tunable OPO

计算了小信号近似下,KTP晶体中三波互作用允许角,分析了允许角随输出波长的变化规律。研究了Nd:YAG1064nm泵浦的KTP OPO在x—z调谐面上的相位匹配,输出波长不同时失配角的变化对相位失配系数的影响,晶体长度对允许角的影响,以及在一定的调谐精度范围内晶体长度对转换效率的影响。所得结果对红外可调谐参量振荡器的技术设计提供了理论依据。

This paper calculates the allowing angle of interaction of three waves in KTP crystal in smallsignal proximity. It gets the change of allowing angle with output wavelength and the crystal length. And the tuning curves of KTPOPO, which pumped by Nd:YAG laser(1 064nm), are calculated. Furthermore, it also discusses the influence of mismatching angle on phase mismatching coefficient at various output wavelengths and in the same tuning precision the influence of the crystal length on efficiency. The results provide some theoretical references for optimized design of infrared tunable OPO.