KDP晶体高效二倍频理论计算

The alignment technique for COIL unstable ring resonator with 90°beam rotation

根据三波耦合方程研究了基波功率密度、晶体长度、相位匹配类型、相位失配角、离散角等因素对ＫＤＰ晶体倍频转换效率的影响。给出了不同长度ＫＤＰ晶体Ⅱ类相位匹配的理论计算曲线，由此选择最佳条件进行实验，获得近８０％的倍频转换效率。

Using unstable ring resonator with 90°beam rotation is the most available method to obtain high power laser and excellant beam quality from a low gain laser.With the aid of an auxiliary He Ne lsaer,the alignment technique for this resonator is presented in this paper.