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。

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The transformation of Hermite Gaussian laser beam through random phase plate is discussed in detail by partial coherence theory in this paper.

本文利用部分相干理论研究了高阶厄米-高斯光束通过随机位相片的变换。

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By the aid of the phase shift-frequency characteristic, the conformal transformation and the perturbation theory, a new kind of compact, broadband waveguide phase shifter is developed.

借助相移-频率特性、保角变换和微扰理论，研制出了新型的宽带移相器。

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