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Title:Mid-infrared frequency-agile dual-comb spectroscopy
Author(s):Luo, Pei-Ling
Contributor(s):Picqué, Nathalie; Hänsch, Theodor W.; Millot, Guy; Iwakuni, Kana; Yan, Ming
Subject(s):Instrument/Technique Demonstration
Abstract:We demonstrate a new approach to mid-infrared dual-comb spectroscopy. It opens up new opportunities for accurate real-time spectroscopic diagnostics and it significantly simplifies the technique of dual-comb spectroscopy. Two mid-infrared frequency combs of slightly different repetition frequencies and moderate, but rapidly tunable, spectral span are generated in the 2800-3200 cm$^{-1}$ region. The generators rely on electro-optic modulators, nonlinear fibers$\footnote{G. Millot, S. Pitois, M. Yan, T. Hovannysyan, A. Bendahmane, T.W. H\"{a}nsch, N. Picqu\'{e}, Frequency-agile dual-comb spectroscopy, Nature Photonics 10, 27-30 (2016).}$ for spectral broadening and difference frequency generation and do not involve mode-locked lasers. Flat-top frequency combs span up to 10 cm$^{-1}$ with a comb line spacing of 100 MHz (3$\times$10$^{-3}$ cm$^{-1}$). The performance of the spectrometer without any phase-lock electronics or correction scheme is illustrated with spectra showing resolved comb lines and Doppler-limited spectra of methane. High precision on the spectroscopic parameter (line positions and intensities) determination is demonstrated for spectra measured on a millisecond time scale and it is validated with comparison with literature data.
Issue Date:2016-06-21
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper/Presentation
Rights Information:Copyright 2016 by the authors
Date Available in IDEALS:2016-08-22

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