Numerical analyses of the allowed parametrical errors in tunable OPO

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.