Multiplexed detection of CO2 using a novel dual comb spectrometer

Fleisher, Adam J.

Permalink

https://hdl.handle.net/2142/50792 Copy

Description

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.

Issue Date

2014-06-17

Keyword(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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/50792

DOI

https://doi.org/10.15278/isms.2014.TJ04

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

Owning Collections