Coddington, I.
, Swann, W.
and Newbury, N.
(2010),
Dual frequency comb Fourier transform spectroscopy, Physical Review A (Atomic, Molecular and Optical Physics)
(Accessed April 25, 2024)
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Dual frequency comb Fourier transform spectroscopy
Published
Author(s)
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Abstract
Dual coherent frequency combs can be used in Fourier transform spectroscopy (FTS) to generate the full optical response of a sample with high frequency, and time, accuracy and resolution. The approach can be viewed equally well as a multiheterodyne, coherent Fourier transform, or time-domain spectroscopy. We discuss the performance and design of a coherent dual-comb FTS system in the near infrared that uses two coherent fiber frequency combs phase-locked to each other and to an underyling cw optical reference. We measure the fully normalized, complex response of a gas sample over 9 THz of spectrum at 200 MHz frequency resolution yielding 45,000 resolution elements. The average spectral signal-to-noise ratio (SNR) is 2,500 for both the fractional absorption and the phase in radians, with a peak SNR of 4,000. The corresponding time-domain SNR is 0.6×10^6. We describe the overall experimental system and provide example data illustrating the performance.Citation
Physical Review A (Atomic, Molecular and Optical Physics)
Volume
82
Pub Type
Journals
Keywords
Fourier transform spectroscopy, frequency comb, FTS, Spectroscopy
Citation
Created October 12, 2010, Updated February 19, 2017