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Mid-infrared feed-forward dual-comb spectroscopy.

Zaijun Chen1, Theodor W Hänsch2,3, Nathalie Picqué2

  • 1Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|February 14, 2019
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Dual-comb spectroscopy achieves over half an hour of coherence time in the mid-infrared region. This breakthrough enables highly precise molecular spectroscopy for studying gas-phase molecules.

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Area of Science:

  • Molecular Spectroscopy
  • Quantum Optics
  • Physical Chemistry

Background:

  • Mid-infrared high-resolution spectroscopy is crucial for analyzing gas-phase molecular structure and dynamics.
  • Frequency combs have significantly advanced the precision of molecular spectroscopy.

Purpose of the Study:

  • To demonstrate dual-comb spectroscopy in the 3-µm spectral region for fundamental CH stretch vibrations.
  • To achieve long experimental coherence times for enhanced spectroscopic precision.

Main Methods:

  • Utilizing dual-frequency combs for mid-infrared Fourier transform spectroscopy.
  • Achieving experimental coherence times exceeding half an hour between the frequency combs.
  • Employing self-calibration of the frequency scale and minimizing instrumental line shape contributions.

Main Results:

  • Demonstrated dual-comb spectroscopy with unprecedented coherence times exceeding 30 minutes.
  • Achieved high signal-to-noise ratios and broad spectral bandwidths.
  • Minimized instrumental line shape effects on spectral profiles.

Conclusions:

  • Dual-comb spectroscopy in the mid-infrared offers new opportunities for precision spectroscopy of small molecules.
  • The technique enables highly multiplexed metrology of molecular line shapes.
  • This advancement pushes the boundaries of molecular structure and dynamics studies.