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为了获得高效的二次、三次倍频的转换效率，ＫＤＰ晶体的定向精度非常重要，尤其是以ＫＤＰ晶体光轴的严格定向为前提的。对于大尺寸晶体，定向的常用方法Ｘ射线衍射法和偏振光干涉法都有各自的局限性，因此，我们采用了一种用Ｎｄ∶ＹＡＧ激光器装置直接确定ＫＤＰ倍频晶体的定向偏差以及ｏ轴与ｅ轴方向的方法。报道了实验原理方法和结果
In order to obtain efficient second and third harmonic conversion efficiency, KDP crystal orientation accuracy is very important, especially in the KDP crystal optical axis of the strict orientation of the premise. For large crystals, X-ray diffraction and polarization interferometry, the commonly used methods of orientation, have their own limitations. Therefore, we use a method of using Nd: YAG laser to directly determine the directional deviation of the KDP frequency doubling crystal and the o-axis Method with e-axis direction. Reported the experimental principles and results