Newbury, N.
, Coddington, I.
and Swann, W.
(2010),
Sensitivity of coherent dual-comb spectroscopy, Optics Express, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904845
(Accessed October 14, 2025)
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Sensitivity of coherent dual-comb spectroscopy
Published
Author(s)
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Abstract
Coherent dual comb spectroscopy can provide high-resolution, high-accuracy measurements of a sample response in both magnitude and phase. We discuss the achievable signal-to-noise ratio (SNR) due to both additive white noise and multiplicative noise, and the corresponding sensitivity limit for trace gas detection. We show that sequential acquisition of the overall spectrum through a tunable filter, or parallel acquisition of the overall spectrum through a detector array, can significantly improve the SNR under some circumstances. We identify a useful figure of merit as the quality factor, equal to the product of the SNR, normalized by the square root of the acquisition time, and the number of resolved frequency elements. For a single detector and fiber-laser based system, this quality factor is 10^6 - 10^7 Hz^1/2.Citation
Optics Express
Volume
18
Issue
8
Pub Type
Journals
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Keywords
frequency comb, spectroscopy
Citation
Issues
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Created March 31, 2010, Updated February 19, 2017