...S）， 当调制频率与激光输出频率的半宽相当或者大于激 光输出频率半宽时称为频率调制光谱（Frequency Modulation Spectroscopy，FMS）。
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射频频率调制光谱技术 radio-frequency FM spectroscopy
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.
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。
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.
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