Dual-comb spectroscopy based on quantum-cascade-laser frequency combs

Gustavo Villares (), Andreas Hugi, Stéphane Blaser and Jérôme Faist ()
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Gustavo Villares: Institute for Quantum Electronics, ETH Zurich
Andreas Hugi: Institute for Quantum Electronics, ETH Zurich
Stéphane Blaser: Alpes Lasers SA, 1-3 Max.-de-Meuron, C.P. 1766
Jérôme Faist: Institute for Quantum Electronics, ETH Zurich

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract Dual-comb spectroscopy performed in the mid-infrared—where molecules have their strongest rotovibrational absorption lines—offers the promise of high spectral resolution broadband spectroscopy with very short acquisition times (μs) and no moving parts. Recently, we demonstrated frequency comb operation of a quantum-cascade-laser. We now use that device in a compact, dual-comb spectrometer. The noise properties of the heterodyne beat are close to the shot noise limit. Broadband (15 cm−1) high-resolution (80 MHz) absorption spectroscopy of both a GaAs etalon and water vapour is demonstrated, showing the potential of quantum-cascade-laser frequency combs as the basis for a compact, all solid-state, broadband chemical sensor.

Date: 2014
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DOI: 10.1038/ncomms6192

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