Skip to Main content Skip to Navigation
Preprints, Working Papers, ...

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.
Document type :
Preprints, Working Papers, ...
Complete list of metadata

Cited literature [43 references]  Display  Hide  Download
Contributor : Nathalie Picqué Connect in order to contact the contributor
Submitted on : Thursday, August 13, 2009 - 11:31:17 AM
Last modification on : Sunday, June 26, 2022 - 11:50:17 AM
Long-term archiving on: : Thursday, June 30, 2011 - 11:45:53 AM


Files produced by the author(s)


  • HAL Id : hal-00409826, version 1
  • ARXIV : 0908.1928



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



Record views


Files downloads