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Raman Spectroscopy Instrumentation: Overview01:26

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Related Experiment Video

Updated: Jun 10, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Spectrally resolved laser ranging with frequency combs.

Martin Godbout1, Jean-Daniel Deschênes, Jérôme Genest

  • 1Centre d'optique, photonique et laser, Université Laval, Québec, G1K 7P4, Canada.

Optics Express
|August 20, 2010
PubMed
Summary
This summary is machine-generated.

This study demonstrates spectrally resolved ranging of diffuse reflectors using sliding frequency combs. This technique achieves precise distance measurements with high spatial and spectral resolution for short-range applications.

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Laser Physics

Background:

  • Frequency combs are advanced laser sources with applications in precision measurement.
  • Spectrally resolved ranging offers detailed information about targets.
  • Short-distance measurements present unique challenges for ranging techniques.

Purpose of the Study:

  • To develop and demonstrate a novel spectrally resolved ranging method for diffuse reflectors at short distances.
  • To utilize the multiheterodyne beatnote of sliding frequency combs for ranging.
  • To enhance the non-ambiguous range of the ranging system.

Main Methods:

  • Generating sliding frequency comb sources using a mode-locked laser and a two-beam interferometer.
  • Employing a multiheterodyne beatnote analysis between two sliding frequency combs.
  • Implementing pseudo-random binary modulation of the laser pulses.

Main Results:

  • Achieved spectrally resolved ranging of diffuse reflectors.
  • Demonstrated a spatial resolution of 21 cm.
  • Obtained a spectral resolution of 10 cm⁻¹ over a 200 cm⁻¹ spectral range.

Conclusions:

  • The multiheterodyne beatnote of sliding frequency combs is effective for short-distance spectrally resolved ranging.
  • Pseudo-random binary modulation successfully extends the non-ambiguous range.
  • The demonstrated technique offers high resolution for characterizing diffuse reflectors.