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.
根据激光对人眼损伤机理，给出了标识危害距离公式，并阐述了非线性光学防护材料的防护原理。
In this paper, we obtained the formula of Nominal ocular hazard distance in the harm theories of lasers to eyes, and the principle of the nonlinear optical protective material was introduced.
文章对密着网屏的基本使用原理作了分析，并以数种实验结果解释网屏如何用在非线性光学图象处理上。
The basic principle of the use of the contact screens is analyzed with some experimental results illustrating applications of the technique to non-linear image processing.
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