名词
中文翻译：第二谐波
同义词：
['secondary harmonic', 'second-order harmonic']
例句：
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1. The spectrum ofa laser is composed of the first and second harmonics.
激光的光谱由第一和第二谐波组成。
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2.In the study of nonlinear optical effects, second harmonic generation is a key process.
在非线性光学效应研究中，二次谐波产生是关键过程。
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3. The second harmonics of the laser beam are used for medical imaging.
激光束的第二谐波被用于医学成像。