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进行了双束激光和频相位匹配的理论分析，给出了KTP 和LBO 两种晶体在和频时的最佳相位匹配角和有效和频系数。
The phase matching conditions for sum frequency generation are analyzed. The optimum phase matching angles and effective nonlinear coefficients for KTP and LBO are derived and 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。
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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