4.8 Article

Mid-infrared feed-forward dual-comb spectroscopy

出版社

NATL ACAD SCIENCES
DOI: 10.1073/pnas.1819082116

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frequency comb; laser spectroscopy; mid-infrared; molecular spectroscopy

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  1. Munich Center for Advanced Photonics
  2. Carl-Friedrich-von-Siemens Foundation

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Mid-infrared high-resolution spectroscopy has proven an invaluable tool for the study of the structure and dynamics of molecules in the gas phase. The advent of frequency combs advances the frontiers of precise molecular spectroscopy. Here we demonstrate, in the important 3-mu m spectral region of the fundamental CH stretch in molecules, dual-comb spectroscopy with experimental coherence times between the combs that exceed half an hour. Mid-infrared Fourier transform spectroscopy using two frequency combs with self-calibration of the frequency scale, negligible contribution of the instrumental line shape to the spectral profiles, high signal-to-noise ratio, and broad spectral bandwidth opens up opportunities for precision spectroscopy of small molecules. Highly multiplexed metrology of line shapes may be envisioned.

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