论文信息 - Frequency-switched heterodyne cavity ringdown spectroscopy.

Frequency-switched heterodyne cavity ringdown spectroscopy.

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.

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