We have also discussed the effect of the beam divergence on the second harmonic conversion efficiency.

还讨论了泵浦束的发散角对二次谐波转换效率的影响。

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Based on the optical rotatory dispersion effect, an optical filter for selecting the second harmonic of a frequency-doubled laser is constructed from quartz in combination with polarizers.

针对倍频激光中存在基频光的实际情况，依据石英晶体的旋光特性，利用石英晶体和起偏棱镜的组合，设计了一种用于去除倍频激光中基频光的光学滤波器。

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