Cited by 322Spectroscopy and Laser ApplicationsAdvanced Fiber Laser TechnologiesLaser-Matter Interactions and Applications

Coherent dual-comb spectroscopy at high signal-to-noise ratio

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Coddington, I., Swann, W., Newbury, N.·2010·Physical Review A

Abstract

Two coherent frequency combs are used to measure the full complex response of a sample in a configuration analogous to a dispersive Fourier transform spectrometer, infrared time domain spectrometer, or a multiheterodyne laser spectrometer. This dual-comb spectrometer retains the frequency accuracy and resolution of the reference underlying the stabilized combs. We discuss the specific design of our coherent dual-comb spectrometer and demonstrate the potential of this technique by measuring the overtone vibration of hydrogen cyanide, centered at THz ( nm). We measure the fully normalized, complex response of the gas over a THz bandwidth at MHz frequency resolution yielding resolution elements. The average spectral signal-to-noise ratio (SNR) over the THz bandwidth is for both the magnitude and phase of the measured spectral response and the peak SNR is . This peak SNR corresponds to a fractional absorption sensitivity of and a phase sensitivity of microradians. As the spectral coverage of combs expands, coherent dual-comb spectroscopy could provide high-frequency accuracy and resolution measurements of a complex sample response across a range of spectral regions. Work of U. S. government, not subject to copyright.

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Crossref · 10.1103/physreva.82.043817

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  • The widths of the calculated absorption lines are 0.90, 0.85, and 0.91 GHz, respectively.

    “The widths of the calculated absorption lines are 0.90, 0.85, and 0.91 GHz, respectively.”

    From Jitter correction for asynchronous optical sampling terahertz spectroscopy using free-running pulsed lasers (2023) · cites this paper as [28]

    Section III.D (p. 13) describes measured HCN absorption-line profiles, and Section IV.A (p. 16) discusses linewidths generally, but neither gives the claimed calculated widths. Searches for 0.90, 0.85, and 0.91 GHz found no passage reporting those values. (LLM, conf=0.73)

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  • The measured spectra and the HITRAN database show good agreement in both absorption intensity and linewidth.

    “The measured spectra and the database show good agreement in terms of both the absorption intensity and linewidth.”

    From Jitter correction for asynchronous optical sampling terahertz spectroscopy using free-running pulsed lasers (2023) · cites this paper as [28]

    The Fig. 7 caption (p. 13) describes measured HCN absorption profiles and their expected broadening, but does not compare their intensities or linewidths with a database. A search for HITRAN and for database agreement found no passage in our copy making that comparison. (LLM, conf=0.75)

    Experimental — accuracy not yet measured

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Authors
Coddington, I., Swann, W., & Newbury, N.
Affiliations
National Institute of Standards and Technology (US)
Venue
Physical Review A
Published
2010-10-12
Volume
82
Issue
4
ISSN
  • 0556-2791 (ISSN-L)
  • 1050-2947
  • 1094-1622
OpenAlex
W1998377056
Cited by
322
References
67
Citations by year
2026: 8 · 2025: 20 · 2024: 24 · 2023: 32 · 2022: 16 · 2021: 23 · 2020: 16 · 2019: 22 · 2018: 38 · 2017: 17 · 2016: 33 · 2015: 20 · 2014: 20 · 2013: 8 · 2012: 11
FWCI
4.85
Type
journal article
Language
en
Open access
Locations
  • Physical Review A (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Chemistry › Spectroscopy › Spectroscopy and Laser Applications
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Advanced Fiber Laser Technologies
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
Keywords
frequency combs, signal-to-noise ratio, hydrogen cyanide, overtone vibrations, terahertz spectroscopy, phase sensitivity, absorption sensitivity, high frequency resolution

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