Cavity-enhanced dual-comb spectroscopy

By B. Bernhardt, A. Ozawa, P. Jacquet, M. Jacquey, Y. Kobayashi, T. Udem, Ronald Holzwarth, G. Guelachvili, T. Hansch, N. Picqué. 2009

522 citations recorded by the source corpus.

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 identified1 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. By combining Fourier transform spectroscopy with two frequency-shifted combs and cavity ring-down spectroscopy, scientists demonstrate a powerful new tool for ultrahigh sensitivity spectroscopy. The scheme can measure broadband, high-resolution spectra in tens of microseconds, does not require detector arrays and may allow tuning from terahertz to ultraviolet frequencies.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Spectroscopy

View Paper: https://www.semanticscholar.org/paper/48f0f1733d67111f9a4caec1a377bf33022136c4

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In Atomic and Molecular Physics, and Optics

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Citations in the corpus

Cavity-enhanced direct frequency comb spectroscopy (2008, background): “They allow measurements in the spectral range where a VIPA etalon is not readily available and also do not suffer from the trade-off between resolution and bandwidth due to the limited detector array sizes [168].”
Mid-infrared dual-comb spectroscopy with 2.4 μm Cr2+:ZnSe femtosecond lasers (2010, background): “Recent experiments [3,4] of multi-heterodyne frequency”
Broadband RF Channelizer Based on an Integrated Optical Frequency Kerr Comb Source (2018, background): “Recent advances in dual-comb spectroscopy provide new possibilities for that [23], [51]–[53].”