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.
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。
WENXIAN TONGKAO summarized the transformation of institutions by wide historical angle of view, afforded reference for the real society.
《文献通考》从更为开阔的历史视角总结典制因革，为经世之用提供制度模式的参照；
This text analyzed the legislative transformation of the social transformation from the interactive relation angle between social transformation and law transition.
本文从社会转型与法律变迁互动关系的角度切入，分析了当代中国社会转型中立法转型的问题。
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