It is a self frequency double laser in some hosts.
选择合适的基质，可产生自倍频可见激光。
Objective: To observe the effect of double frequency YAG laser in treating pterygium.
目的：观察倍频y AG激光治疗早期翼状胬肉的临床效果。
In this spectroscopy, both laser frequency and Zeeman effect of a sample are modulated, and then the signal with high signal to noise will be obtained by double demodulation.
它同时对激光频率和样品的塞曼效应进行调制，然后通过双解调来提取微弱的光谱信号。
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