Longwave infrared (6.6–11.4 µm) dual-comb spectroscopy with 240,000 comb-mode-resolved data points at video rate

Vasilyev, Sergey; Muraviev, Andrey; Konnov, Dmitrii; Mirov, Mike; Smolski, Victor; Moskalev, Igor; Mirov, Sergey; Vodopyanov, Konstantin

doi:10.1364/ol.477346

Longwave infrared (6.6–11.4 µm) dual-comb spectroscopy with 240,000 comb-mode-resolved data points at video rate

Journal Article · Sun Jan 01 04:00:00 EST 2023 · Optics Letters

DOI:https://doi.org/10.1364/ol.477346· OSTI ID:2420778

^[1]; Muraviev, Andrey; ; ; ; ; ; Vodopyanov, Konstantin

OSTI

Using sub-3-cycle pulses from mode-locked Cr:ZnS lasers atλ ≈ 2.4 µm as a driving source, we performed high-resolution dual-frequency-comb spectroscopy in the longwave infrared (LWIR) range. A duo of highly coherent broadband (6.6–11.4 µm) frequency combs were produced via intrapulse difference frequency generation in zinc germanium phosphide (ZGP) crystals. Fast (up to 0.1 s per spectrum) acquisition of 240,000 comb-mode-resolved data points, spaced by 80 MHz and referenced to a Rb clock, was demonstrated, resulting in metrology grade molecular spectra of N₂O (nitrous oxide) and CH₃OH (methane). The key to high-speed massive spectral data acquisition was low intensity and phase noise of the LWIR combs and high (7.5%) downconversion efficiency, resulting in a LWIR power of 300 mW for each comb.

Research Organization:: Univ. of Alabama, Birmingham, AL (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0018378

OSTI ID:: 2420778

Journal Information:: Optics Letters, Journal Name: Optics Letters Journal Issue: 9 Vol. 48; ISSN OPLEDP; ISSN 0146-9592

Publisher:: Optical Society of America (OSA)

Country of Publication:: United States

Language:: English

References (18)

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