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Open-air, broad-bandwidth trace gas sensing with a mid-infrared optical frequency comb

Published

Author(s)

Lora L. Nugent-Glandorf, Scott A. Diddams

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

Keywords

Frequency Comb, greenhouse gas, methane, mid-infrared, Spectroscopy

Citation

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 May 24, 2022)
Created March 20, 2015, Updated February 19, 2017