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Updated: May 24, 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

5 μm laser source for frequency metrology based on difference frequency generation.

Ulf Bressel1, Ingo Ernsting, Stephan Schiller

  • 1Institut für Experimentalphysik, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany. Ulf.Bressel@uni‐duesseldorf.de

Optics Letters
|March 2, 2012
PubMed
Summary

A new tunable 5 μm laser source was developed using quantum dot and Nd:YAG lasers. This narrow-linewidth continuous-wave (cw) source is ideal for high-precision spectroscopic applications.

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Area of Science:

  • Quantum optics and laser spectroscopy
  • Materials science for nonlinear optics

Background:

  • Development of mid-infrared (mid-IR) laser sources is crucial for various spectroscopic applications.
  • Existing sources often lack tunability, narrow linewidth, or sufficient output power in the 5 μm range.

Purpose of the Study:

  • To develop and evaluate a novel narrow-linewidth continuous-wave (cw) 5 μm laser source.
  • To assess its suitability for high-precision spectroscopic measurements.

Main Methods:

  • Difference frequency generation (DFG) was employed.
  • A 1.3 μm quantum dot external cavity diode laser (QD-ECL) and a cw Nd:YAG laser were used as input sources.
  • Periodically poled MgO-doped lithium niobate (PPMgO:LN) served as the nonlinear medium.
  • Output frequency stabilization and measurement were achieved using a frequency comb.

Main Results:

  • A tunable cw 5 μm source was successfully developed.
  • The source provides output power up to 0.1 mW in the 5.09-5.13 μm range and sub-microwatt output in the 5.42-5.48 μm range.
  • Frequency instability was measured to be less than 4 kHz, with a linewidth below 700 kHz.

Conclusions:

  • The developed DFG source offers a stable, narrow-linewidth, and tunable output in the 5 μm region.
  • This laser system demonstrates significant potential for advanced spectroscopic applications requiring high frequency resolution.