AI 中文总结
研究单轴晶体中相角与有效SHG系数，借助优化理论给出计算公式，进而得出最佳相角、方位角及有效SHG系数，且计算仅依赖二阶极化率张量主分张量。
AI 中文摘要
本文借助优化理论给出了单轴晶体中两类最大有效二次谐波产生（SHG）系数的相角计算公式。利用这些公式，给出了所有单轴晶体类别的最佳相角、方位角及其有效SHG系数。此外，这些计算仅依赖于二阶极化率张量的一些主分张量。
英文摘要
In this paper, the calculation formulae of phase angle are given for two classes of largest effective SHG coefficients in uniaxial crystals by means of the optimization theory. With the help of such calculation formulae, we present the best phase angles and azimuth angles of all uniaxial crystals class, as well as their effective SHG coefficients. Furthermore, these calculation is only dependent upon some principal subtensor of second order susceptibility tensor.
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