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Optical re-injection in cavity-enhanced absorption spectroscopy.

J Brian Leen1, Anthony O'Keefe1

  • 1Los Gatos Research, 67 E. Evelyn Avenue, Suite 3, Mountain View, California 94041, USA.

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|October 3, 2014
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This study introduces a novel method for cavity-enhanced absorption spectrometry by re-injecting light reflected from the front mirror. This technique significantly boosts circulating power, enhancing ultrasensitive trace gas detection, especially in the mid-infrared.

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Area of Science:

  • Spectroscopy
  • Optical Physics
  • Analytical Chemistry

Background:

  • Cavity-enhanced absorption spectrometry offers ultrasensitive trace gas detection.
  • Performance limitations arise from low optical transmission due to front mirror reflection.
  • Mid-infrared applications are particularly affected by light intensity and detector sensitivity limits.

Purpose of the Study:

  • To enhance the performance of cavity-enhanced absorption spectrometry.
  • To overcome limitations imposed by low optical transmission and detector sensitivity.
  • To improve signal-to-noise ratio in absorption measurements.

Main Methods:

  • Developed and modeled a method for re-injecting light reflected from the front mirror of an optical cavity.
  • Experimentally demonstrated the method using off-axis cavity ringdown spectroscopy (OA-CRDS).
  • Utilized a broadly tunable external cavity quantum cascade laser.

Main Results:

  • Achieved a 22.5-fold increase in coupled optical power to the detector.
  • Measured cavity loss with a precision of 2 × 10⁻¹⁰ cm⁻¹/√Hz.
  • Demonstrated a 12-fold improvement in sensitivity compared to standard OA-CRDS.

Conclusions:

  • The re-injection method significantly boosts circulating power and signal-to-noise ratio.
  • The technique achieves high sensitivity comparable to the best mid-infrared measurements.
  • Successfully applied to resolve weakly absorbing spectral features of volatile organic compounds.