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A mid-Infrared frequency comb is produced via an optical parametricoscillator (OPO) pumped by an amplified 100 MHz Yb:fiber mode-locked laser. Weuse this source to make measurements of the concentration of theatmospherically-relevant species of CH4 and H2O over a bandwidth of 100 nmcentered at 3.25 um. Multiple absorption lines for each species are detectedwith millisecond acquisition time using a virtually-imaged phased array (VIPA)spectrometer. The measured wavelength-dependent absorption profile is comparedto and fitted by a model, yielding quantitative values of the atmosphericconcentration of both CH4 and H2O in a controlled indoor environment, as wellas over a 26 m open air outdoor path.

Open-Air, Broad-Bandwidth Trace-Gas Sensing with a Mid-Infrared Optical Frequency Comb