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Periodically locked continuous-wave cavity ringdown spectroscopy.

Nicola J van Leeuwen1, Jan C Diettrich, Andrew C Wilson

  • 1Department of Physics, University of Otago, P.O. Box 56, Dunedin, New Zealand. nicolav@physics.otago.ac.nz

Applied Optics
|July 2, 2003
PubMed
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We developed a fast cavity ringdown spectroscopy method achieving 16,000 measurements per second. This technique significantly enhances sensitivity for detecting minute absorption losses.

Area of Science:

  • Spectroscopy
  • Cavity Ringdown Spectroscopy
  • Laser Spectroscopy

Background:

  • Cavity Ringdown Spectroscopy (CRDS) is a sensitive technique for measuring absorption.
  • Traditional CRDS methods can be limited by acquisition speed.
  • High-finesse optical cavities are crucial for achieving high sensitivity.

Purpose of the Study:

  • To develop a periodically locked continuous-wave (cw) cavity ringdown spectroscopy technique.
  • To significantly increase the number of ringdown events acquired per second.
  • To improve the sensitivity of absorption loss measurements.

Main Methods:

  • Utilizing an external cavity diode laser locked to a high-finesse optical cavity.
  • Implementing a periodic switching method to rapidly acquire ringdown events (up to 16,000 per second).

Related Experiment Videos

  • Rapidly reacquiring cavity lock after each ringdown event.

    • Main Results:

    • Achieved acquisition rates of 16,000 ringdown events per second.
    • Demonstrated a minimum detectable absorption loss of 4.7 x 10⁻⁹ cm⁻¹.
    • Projected sensitivity of 5.9 x 10⁻¹⁰ cm⁻¹ Hz⁻¹/² with faster digitization.

    Conclusions:

    • The developed periodically locked cw CRDS technique enables rapid acquisition of numerous ringdown events.
    • This method offers a pathway to significantly enhanced sensitivity in absorption spectroscopy.
    • The technique's performance is primarily limited by the digitization rate, indicating potential for further improvement.