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Proceedings Paper

Precision spectroscopy with frequency combs at 3.4 μm
Author(s): Esther Baumann; Fabrizio R. Giorgetta; William C. Swann; Alex M. Zolot; Ian Coddington; Nathan R. Newbury
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Paper Abstract

We discuss precision spectroscopy with a comb-based spectrometer at 3.4 μm. Our goal is to explore comb-based spectroscopy as an alternative method for fast, highly resolved, accurate measurements of gas line shapes. The spectrometer uses dual 1.5 μm frequency combs down converted to 3.4 μm via difference frequency generation (DFG) with a stabilized 1 μm fiber laser. One 3.4 μm comb is transmitted through methane and heterodyned against the second, offset comb to measure the gas absorption and dispersion. Doppler-broadened methane spectral lines are measured to below 1 MHz uncertainty. We also discuss the higher sensitivity alternative of a comb-assisted swept-laser DFG spectrometer.

Paper Details

Date Published: 17 September 2011
PDF: 9 pages
Proc. SPIE 8154, Infrared Remote Sensing and Instrumentation XIX, 81540B (17 September 2011); doi: 10.1117/12.896692
Show Author Affiliations
Esther Baumann, National Institute of Standards and Technology (United States)
Fabrizio R. Giorgetta, National Institute of Standards and Technology (United States)
William C. Swann, National Institute of Standards and Technology (United States)
Alex M. Zolot, National Institute of Standards and Technology (United States)
Ian Coddington, National Institute of Standards and Technology (United States)
Nathan R. Newbury, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 8154:
Infrared Remote Sensing and Instrumentation XIX
Marija Strojnik; Gonzalo Paez, Editor(s)

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