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Proceedings Paper

Spectroscopy with a coherent dual frequency comb interferometer at 3.4 μm
Author(s): Esther Baumann; Fabrizio R. Giorgetta; Ian Coddington; William C. Swann; Nathan R. Newbury
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Paper Abstract

A coherent dual fiber-comb spectrometer centered at 1.5 μm wavelengths is transferred to 3.4 μm by differencefrequency generation with a 1064 nm cw laser. It is shown that the residual linewidth between the comb teeth at 3.4 μm is resolution-limited to 200 mHz; such narrow linewidths can enable coherent dual-comb spectroscopy at high-precision and signal-to-noise ratio. We then discuss different interferometric configurations for coherent dual-comb spectroscopy. We find that a two-branch interferometric setup is appropriate to measure both the magnitude and phase spectrum of purely Doppler-broadened absorption lines. An initial measurement of methane lines in the υ3 band P-branch with a resolution of 114 MHz is demonstrated.

Paper Details

Date Published: 2 August 2010
PDF: 8 pages
Proc. SPIE 7790, Interferometry XV: Techniques and Analysis, 77900X (2 August 2010); doi: 10.1117/12.859730
Show Author Affiliations
Esther Baumann, National Institute of Standards and Technology (United States)
Fabrizio R. Giorgetta, National Institute of Standards and Technology (United States)
Ian Coddington, National Institute of Standards and Technology (United States)
William C. Swann, National Institute of Standards and Technology (United States)
Nathan R. Newbury, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 7790:
Interferometry XV: Techniques and Analysis
Catherine E. Towers; Joanna Schmit; Katherine Creath, Editor(s)

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