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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。
The allowable angle of three-wave interaction in KTP crystal is calculated under small signal approximation, and the law of variation of permissible angle with output wavelength is analyzed. The phase matching of Nd: YAG1064nm-pumped KTP OPO on the x-z tuning surface is studied. The effect of the mismatch angle on the phase mismatch coefficient, the effect of crystal length on the allowable angle, Effect of crystal length on conversion efficiency in the accuracy range. The results provide a theoretical basis for the technical design of infrared tunable parametric oscillator.