Nugent-Glandorf, L.
and Diddams, S.
(2015),
Open-air, broad-bandwidth trace gas sensing with a mid-infrared optical frequency comb, Applied Physics B
(Accessed October 11, 2025)
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Open-air, broad-bandwidth trace gas sensing with a mid-infrared optical frequency comb
Published
Author(s)
,
Abstract
A mid-Infrared frequency comb is produced via an optical parametric oscillator (OPO) pumped by an amplified 100 MHz Yb:fiber mode-locked laser. We use this source to make measurements of the concentration of the atmospherically-relevant species of CH4 and H2O over a bandwidth of 100 nm centered at 3.25 υm. Multiple absorption lines for each species are detected with millisecond acquisition time using a virtually-imaged phased array (VIPA) spectrometer. The measured wavelength-dependent absorption profile is compared to and fitted by a model, yielding quantitative values of the atmospheric concentration of both CH4 and H2O in a controlled indoor environment, as well as over a 26 m open air outdoor path.Citation
Applied Physics B
Pub Type
Journals
Keywords
Frequency Comb, greenhouse gas, methane, mid-infrared, Spectroscopy
Citation
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Created March 20, 2015, Updated February 19, 2017