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Proceedings Paper

Toward precision measurements of methane with interband cascade lasers
Author(s): Chris Hovde; Daniel B. Oh; Mark A. Zondlo; Chul Soo Kim; Mijin Kim; William Bewley; Chadwick L. Canedy; Igor Vurgaftman; Jerry R. Meyer; S. Gregory Jones; Titania A. R. Schmidt; Kenneth M. Suzuki
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Paper Abstract

Measurement of the isotopic composition of atmospheric methane is a valuable tool for understanding the sources and sinks of the global carbon budget. One promising carbon isotope ratio measurement technology is optical spectroscopy using inter-band cascade (IC) lasers. Ongoing development of these light sources has the goal of providing, from a package operating near room temperature, a single mode laser source in the wavelength range of 3 &mgr;m. The spectral features of methane are sufficiently strong at this wavelength that a path length of about 100 m should suffice for measuring 12- and 13-C isotopes in air without pre-concentrating the sample. Experimental IC lasers are described and their use for isotope sensing by wavelength modulation spectroscopy is evaluated.

Paper Details

Date Published: 5 October 2007
PDF: 6 pages
Proc. SPIE 6756, Chemical and Biological Sensors for Industrial and Environmental Monitoring III, 67560B (5 October 2007); doi: 10.1117/12.734215
Show Author Affiliations
Chris Hovde, Southwest Sciences, Inc. (United States)
Daniel B. Oh, Southwest Sciences, Inc. (United States)
Mark A. Zondlo, Southwest Sciences, Inc. (United States)
Chul Soo Kim, Naval Research Lab. (United States)
Mijin Kim, Naval Research Lab. (United States)
William Bewley, Naval Research Lab. (United States)
Chadwick L. Canedy, Naval Research Lab. (United States)
Igor Vurgaftman, Naval Research Lab. (United States)
Jerry R. Meyer, Naval Research Lab. (United States)
S. Gregory Jones, Southwest Sciences, Inc. (United States)
Titania A. R. Schmidt, Southwest Sciences, Inc. (United States)
Kenneth M. Suzuki, Southwest Sciences, Inc. (United States)

Published in SPIE Proceedings Vol. 6756:
Chemical and Biological Sensors for Industrial and Environmental Monitoring III
Kenneth J. Ewing; James B. Gillespie; Pamela M. Chu; William J. Marinelli, Editor(s)

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