在高功率倍频过程中,非线性倍频晶体由于吸收了基波和谐波的功率,造成倍频晶体内温度的变化,破坏了晶体原来的相位匹配条件,从而导致频率变换效率降低、输出谐波功率不稳定等问题,对于高功率高重复频率激光器系统尤其严重.根据热传导方程分析了晶体内部的热分布,利用非线性晶体的折射率方程分析了非线性倍频晶体温度变化时,其相位匹配、允许参量以及光波走离角的变化情况,为实现高功率倍频激光奠定了理论基础.
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