Mid-infrared dual-comb spectroscopy with electro-optic modulators View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2017-05-03

AUTHORS

Ming Yan, Pei-Ling Luo, Kana Iwakuni, Guy Millot, Theodor W Hänsch, Nathalie Picqué

ABSTRACT

Absorption spectroscopy of fundamental ro-vibrational transitions in the mid-infrared region provides a powerful tool for studying the structure and dynamics of molecules in the gas phase and for sensitive and quantitative gas sensing. Laser frequency combs permit novel approaches to perform broadband molecular spectroscopy. Multiplex dual-comb spectroscopy without moving parts can achieve particularly high speed, sensitivity and resolution. However, achieving Doppler-limited resolution in the mid-infrared still requires overcoming instrumental challenges. Here we demonstrate a new approach based on difference-frequency generation of frequency-agile near-infrared frequency combs that are produced using electro-optic modulators. The combs have a remarkably flat intensity distribution, and their positions and line spacings can be freely selected by simply dialing a knob. Using the proposed technique, we record, in the 3-μm region, Doppler-limited absorption spectra with resolved comb lines within milliseconds, and precise molecular line parameters are retrieved. Our technique holds promise for fast and sensitive time-resolved studies of, for example, trace gases. More... »

PAGES

e17076

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/lsa.2017.76

DOI

http://dx.doi.org/10.1038/lsa.2017.76

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1092312252

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30167208


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