Frequency-switched heterodyne cavity ringdown spectroscopy.
- 15 June 2000
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 25 (12) , 920-922
- https://doi.org/10.1364/ol.25.000920
Abstract
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.Keywords
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