We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Cavity-enhanced dual-comb spectroscopy.
- Authors
Bernhardt, Birgitta; Ozawa, Akira; Jacquet, Patrick; Jacquey, Marion; Kobayashi, Yohei; Udem, Thomas; Holzwarth, Ronald; Guelachvili, Guy; Hänsch, Theodor W.; Picqué, Nathalie
- Abstract
The sensitivity of molecular fingerprinting is dramatically improved when the absorbing sample is placed in a high-finesse optical cavity, because the effective path length is increased. 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. However, efficient analysis of the light transmitted through the cavity remains challenging. Here, a novel approach—cavity-enhanced, frequency-comb, Fourier-transform spectroscopy—fully overcomes this difficulty and enables measurement of ultrasensitive, broad-bandwidth, high-resolution spectra within a few tens of microseconds without any need for detector arrays, potentially from the terahertz to ultraviolet regions. Within a period of just 18 µs, we recorded the spectra of the ammonia 1.0 µm overtone bands comprising 1,500 spectral elements and spanning 20 nm, with a resolution of 4.5 GHz and a noise equivalent absorption at 1 s averaging of 1 × 10−10 cm−1 Hz−1/2, thus opening a route to time-resolved spectroscopy of rapidly evolving single events.
- Subjects
HUMAN fingerprints; SPECTRUM analysis; MOLECULAR emission cavity analysis; MOLECULAR spectroscopy; CHEMICAL detectors
- Publication
Nature Photonics, 2010, Vol 4, Issue 1, p55
- ISSN
1749-4885
- Publication type
Article
- DOI
10.1038/nphoton.2009.217