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Cavity-enhanced dual-comb spectroscopy

Abstract

The sensitivity of molecular fingerprinting is dramatically improved when placing the absorbing sample in a high-finesse optical cavity, thanks to the large increase of the effective path-length. As demonstrated recently, when the equidistant lines from a laser frequency comb are simultaneously injected into the cavity over a large spectral range, multiple trace-gases may be identified within a few milliseconds. Analyzing efficiently the light transmitted through the cavity however still remains challenging. Here, a novel approach, cavity-enhanced frequency comb Fourier transform spectroscopy, fully overcomes this difficulty and measures ultrasensitive, broad-bandwidth, high-resolution spectra within a few tens of µs. It could be implemented from the Terahertz to the ultraviolet regions without any need for detector arrays. We recorded, within 18 µs, spectra of the 1.0 µm overtone bands of ammonia spanning 20 nm with 4.5 GHz resolution and a noise-equivalent-absorption at one-second-averaging per spectral element of 3 10^-12 cm^-1Hz^-1/2, thus opening a route to time-resolved spectroscopy of rapidly-evolving single-events.
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Dates and versions

hal-00409826 , version 1 (13-08-2009)

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Birgitta Bernhardt, Akira Ozawa, Patrick Jacquet, Marion Jacquey, Yohei Kobayashi, et al.. Cavity-enhanced dual-comb spectroscopy. 2009. ⟨hal-00409826⟩
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