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Frequency-switched heterodyne cavity ringdown spectroscopy

机译:频率切换外差腔衰荡光谱

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摘要

When the frequency of light coupled into a cavity is suddenly shifted, the radiation emanating from the input port of the previously excited cavity can beat with the reflection of the frequency-shifted input on the surface of a photodetector. When the beat frequency is stable, the time decay of the resulting optical heterodyne signal can be used to measure intracavity absorption spectra with near quantum-limited sensitivity.
机译:当耦合到腔中的光的频率突然偏移时,从先前受激的腔的输入端口发出的辐射会随着频移的输入在光电探测器表面上的反射而跳动。当拍频稳定时,所得光学外差信号的时间衰减可用于以接近量子限制的灵敏度测量腔内吸收光谱。

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