以前的可调谐紫外激光器是基于可见光区域的可调谐激光，经过非线性频率变换得到。 结构复杂、可靠性差。
The majority of known tunable UV sources were complicated devicescomprising some tunable laser in visible region and subsequent nonlinear frequency conversion.
相乘器是由非线性元件组成，可以实现两个信号的相乘，完成频率变换的电路。
Multiplier is the circuit which is conformed of nonlinear elements and can make two signal multiplied so that it can implement frequency transformation.
在总结激光频率变换的原理和非线性光学晶体的相位匹配理论的基础上，可以根据相位匹配理论进行晶体的相位匹配角的计算。
The principles of laser frequency transformation and the theory of phase matching in nonlinear optic crystals are also discussed. Based on this theory, Angle of phase match is calculated.
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