Abstract
We achieve a quantum-noise-limited absorption sensitivity of per spectral element at 400 s of acquisition time with cavity-enhanced frequency comb spectroscopy, the highest demonstrated for a comb-based technique. The system comprises a frequency comb locked to a high-finesse cavity and a fast-scanning Fourier transform spectrometer with an ultralow-noise autobalancing detector. Spectra with a signal-to-noise ratio above 1000 and a resolution of 380 MHz are acquired within a few seconds. The measured absorption line shapes are in excellent agreement with theoretical predictions.
- Received 11 July 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.233002
© 2011 American Physical Society
Viewpoint
Ultrasensitive Absorption Spectroscopy
Published 28 November 2011
Absorption spectroscopy limited only by quantum noise has been demonstrated over a broad frequency range using laser frequency combs.
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