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本文在获得精确的 7.5mol% Nb∶ KTP晶体的 Sellmeier主折射率色散方程的基础上 ,计算 7.5mol% Nb∶ KTP晶体对 1 .0 6 42μm和 1 .3 1 88μm Nd∶ YAG激光的倍频和和频的 型相位匹配曲线 .通过研究 KTP和 7.5mol% Nb∶ KTP晶体的主折射率 ,双折射率和相位匹配 ,可以看出 Nb掺入 KTP晶体后产生的折射率和双折射率的色散和各向异型的变化是引起 KTP晶体相位变化的根本原因 .
In this paper, based on the Sellmeier principal refractive index dispersion equation of 7.5% Nb: KTP crystal, the frequency doubling frequency of Nd: YAG laser with 0.0642μm and 1.388μm Nd: And the frequency of the phase matching curve.By studying the main refractive index, birefringence and phase matching of KTP and 7.5mol% Nb: KTP crystal, it can be seen that the refractive index and birefringence Chromatic dispersion and anisotropic changes are the fundamental causes of KTP crystal phase changes.