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Coherent multiheterodyne spectroscopy using stabilized optical frequency combs.

Ian Coddington1, William C Swann, Nathan R Newbury

  • 1National Institute for Standards and Technology, Boulder, CO 80305, USA.

Physical Review Letters
|February 1, 2008
PubMed
Summary
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Researchers used fiber frequency combs for multiheterodyne spectroscopy to measure the full spectrum of hydrogen cyanide gas. This technique accurately captures both absorption and phase shifts across a wide bandwidth.

Area of Science:

  • Molecular Spectroscopy
  • Optical Frequency Combs
  • Gas-Phase Chemical Analysis

Background:

  • Accurate measurement of molecular spectra is crucial for various scientific and industrial applications.
  • Traditional spectroscopic methods can be limited in bandwidth, speed, or accuracy.
  • Fiber frequency combs offer a unique broadband, coherent light source for high-precision measurements.

Purpose of the Study:

  • To demonstrate the capability of multiheterodyne spectroscopy using fiber frequency combs for full complex spectrum measurement.
  • To measure the absorption and phase shift spectra of hydrogen cyanide (HCN) gas.
  • To validate the Kramers-Kronig relationship between absorption and phase spectra.

Main Methods:

  • Utilized a narrow-linewidth fiber frequency comb generating 155,000 lines spaced by 100 MHz.

Related Experiment Videos

  • Employed multiheterodyne spectroscopy to probe hydrogen cyanide gas across a 1495–1620 nm wavelength range.
  • Measured both the absorption and phase shift for each individual frequency comb line.

    • Main Results:

    • Successfully measured the complete complex spectrum (absorption and phase) of HCN gas.
    • The measured phase spectrum was found to be in excellent agreement with the Kramers-Kronig transformation of the absorption spectrum.
    • Demonstrated the technique's ability to cover a wide spectral bandwidth with high resolution.

    Conclusions:

    • Multiheterodyne spectroscopy with fiber frequency combs provides rapid, high-accuracy measurement of full complex molecular spectra.
    • Confirms the applicability of the Kramers-Kronig relations in this spectroscopic regime.
    • This technique holds significant potential for advanced gas analysis and fundamental spectroscopy.