其中第二项 导致了倍频效应，又称二次谐波发生（SHG，Second Harmonic Generation）。倍频效应是非线性光学效应中最常见的一种，属二阶非线性 光学效应，倍频材料则属二阶非线性光学材料。
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在Nd：YAG强激光光场的作用下，薄膜样品中观察到二次谐波信号，并分析了二次谐波发生的机理。
The optical second harmonic signal was observed using a ND:YAG laser, The mechanism of SHG was discussed.
另外，SHG显微镜可以与TPF显微镜结合使用同一个激光源。可由二次谐波发生(SHG)显微镜提供形貌信息。
Additional morphological information can be provided by second-harmonic generation (SHG) microscopy, which can be combined with TPF microscopy using the same laser source.
给出用光谱分辨的二次谐波自相关法测量输出脉冲的结果，证实在锁模脉冲中已发生频率调制。
The results of the spectrum-resolved SHG correlation measurements of the mode-locked pulses also are presented, which confirmed the presence of frequency chirping in the pulses.
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