研究锥面状倍频辐射的关键是相位匹配条件。本文利用折射率曲面相交的几何约束条件来代替非共线倍频的相位匹配条件,从而成功地给出了单轴晶体锥面状倍频辐射的起因、特征、变化规律、计算公式以及它们在测定晶体光轴、实时监测晶体主平面、实现共线倍频最佳化等方面的应用。

The key of the research on SHG cones is its phase-matching condition. By way of substituting the phase-matching of noncollinear SHG for the cross-over of its correspondent refractive-index surfaces, we have successfully given the characteristics of SHG cones in uniaxial crystals, the reason for its occurenoe, its change-rule, its relevant formulations, and its application such as determining crystals optics axis, monitoring crystal s main-plane, and realizing the optimization of crystal collinear SHG.