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Simple method for measuring frequency chirps with a Fabry-Perot interferometer.

K S Repasky1, J L Carlsten

  • 1Department of Physics and the Spectrum Laboratory, Montana State University, Bozeman, Montana 59717, USA. repasky@physics.montana.edu

Applied Optics
|March 21, 2008
PubMed
Summary
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A new method directly measures laser frequency chirp by analyzing Fabry-Perot interferometer transmission deviations. This technique accurately quantifies linear chirps in external-cavity laser diodes.

Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Spectroscopy

Background:

  • Characterizing laser frequency chirp is crucial for applications like optical communications and spectroscopy.
  • Existing methods for measuring frequency chirp can be complex or indirect.
  • Fabry-Perot interferometers are widely used for optical measurements but require careful analysis for dynamic phenomena.

Purpose of the Study:

  • To present a simple and direct method for measuring the frequency-chirped response of lasers.
  • To demonstrate the utility of the method by measuring chirps from an external-cavity laser diode.
  • To validate the accuracy of the proposed measurement technique.

Main Methods:

  • Utilizing a Fabry-Perot interferometer to monitor laser transmission.

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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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  • Relating deviations from the ideal Lorentzian line shape to the laser's frequency chirp.
  • Directly measuring the frequency chirp based on the observed line shape distortions.

    • Main Results:

    • Successfully measured a single linear frequency chirp of 800 MHz over 12.3 microseconds.
    • Quantified eight repeated linear chirps, each 800 MHz over 337 microseconds.
    • Demonstrated strong agreement between the measured and theoretically expected frequency-chirped responses.

    Conclusions:

    • The presented method offers a straightforward approach for direct frequency chirp measurement in lasers.
    • The technique is effective for characterizing both single and repetitive linear frequency chirps.
    • This method provides a valuable tool for laser characterization and system optimization.