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Title:Multiplexed detection of CO2 using a novel dual comb spectrometer
Author(s):Fleisher, Adam J.
Contributor(s):Plusquellic, David F.; Hodges, Joseph; Long, David A.
Subject(s):Instrument/Technique Demonstration
Abstract:We report multiheterodyne-detected cavity-enhanced absorption spectroscopy (MH-CEAS) of CO$_{2}$ in the near-infrared using a novel frequency comb light source generated from the electro-optical modulation of a single continuous-wave laser. Using a pair of dual-drive Mach Zehnder modulators we create two frequency combs of slightly different comb mode spacing. The probe comb is coupled to a high-finesse optical cavity containing CO$_{2}$ and then combined with the local oscillator comb on a photodetector. This results in down-conversion of the optical comb to radio frequencies, therefore facilitating fast, multiplexed analysis of the CO$_{2}$ direct absorption signal. The noise-equivalent absorption coefficient for MH-CEAS as initially demonstrated here is $3\times10^{-10}$ cm$^{-1}$ Hz$^{-1/2}$ per spectral element for $\sim$50 simultaneously resolved channels of unique optical frequency.
Issue Date:2014-06-17
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:Fleisher, A.J.; Plusquellic, D.F.; Hodges, J.; Long, D.A. MULTIPLEXED DETECTION OF CO2 USING A NOVEL DUAL COMB SPECTROMETER. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.TJ04
Genre:Conference Paper / Presentation
Rights Information:Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License.
Date Available in IDEALS:2014-09-17

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