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Related Experiment Videos

Continuous-wave frequency comb Fourier transform source based on a high-dispersion cavity.

Thilo Kraetschmer1, Joachim W Walewski, Scott T Sanders

  • 1Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. kraetschmer@wisc.edu

Optics Letters
|October 17, 2006
PubMed
Summary

A novel fiber ring laser generates a unique frequency comb for spectroscopy. This system, without moving parts, offers high resolution and fast measurements for chemical analysis.

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Laser Physics

Background:

  • Fiber ring lasers are crucial for generating optical frequency combs.
  • Spectroscopy demands high resolution and rapid measurement capabilities.
  • Existing methods for comb generation can be complex or lack flexibility.

Purpose of the Study:

  • To develop a simple, robust fiber laser source for generating unequally spaced frequency combs.
  • To demonstrate the application of this comb source in gas spectroscopy.
  • To achieve high spectral resolution and fast acquisition using Fourier transform techniques.

Main Methods:

  • Incorporation of a dispersive grating compressor into a fiber ring laser cavity.
  • Generation of an unequally spaced optical frequency comb (1549-1552 nm).

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  • Detection of spectral components via beating frequencies and Fourier transformation of photodiode signals after passing through hydrogen cyanide gas.

    • Main Results:

    • The fiber laser successfully generated an unequally spaced frequency comb with no moving parts.
    • Spectroscopic analysis of hydrogen cyanide gas was performed using the comb source.
    • A Fourier transform of a 1 ms data record achieved a spectral resolution of 0.06 nm, matching grating spectrometer results.

    Conclusions:

    • The developed fiber laser comb source provides a simple and universal platform for spectroscopy.
    • The technique enables spectroscopy at nearly arbitrary speeds and resolutions limited by Fourier principles.
    • This approach has the potential for widespread applications in chemical analysis and sensing.