Journal
COMMUNICATIONS PHYSICS
Volume 1, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s42005-018-0017-4
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Funding
- Conseil Regional de Bourgogne
- Labex ACTION [ANR-11-LABX-0001-01]
- iXCore Research Fondation
- french Investissements d'Avenir program, project ISITE-BFC [ANR-15-IDEX-0003]
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Mid-infrared dual-comb spectroscopy offers interesting applications since molecules have their strongest rotational-vibrational absorptions in this frequency domain. Besides, generating frequency combs with electro-optic modulators recently showed promising results toward dual-comb spectroscopy. Here, we report a conversion in the mid-infrared of two mutually coherent frequency combs generated with electro-optic modulators to perform dual-comb spectroscopy in this region. Using fourth-order modulation instability taking place in the normal dispersion regime of a highly nonlinear fiber and by seeding this phenomenon with a frequency agile and low-power laser around 1.3 mu m, we develop a stable and wave-length tunable all-fibered dual-comb spectrometer operating in the 2 mu m region. This allows us to investigate CO2 absorption spectra over 37 nm and to measure collisional broadening coefficients of a few rotational-vibrational lines.
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