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Related Experiment Videos

Absorption spectroscopy with quantum cascade lasers.

A A Kosterev1, R F Curl, F K Tittel

  • 1Rice Quantum Institute, Rice University, Houston, TX 77251-1892, USA. akoster@rice.edu

Laser Physics
|July 30, 2002
PubMed
Summary
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New quantum cascade lasers enable sensitive detection of trace gases like nitrous oxide, methane, and water vapor in ambient air. This technology achieved a 125 ppb sensitivity for ethanol detection.

Area of Science:

  • Spectroscopy
  • Laser Technology
  • Environmental Science

Background:

  • Trace gas detection is crucial for environmental monitoring and industrial safety.
  • Quantum cascade lasers (QCLs) offer unique properties for high-resolution spectroscopy.
  • Mid-infrared (MIR) spectroscopy is effective for identifying various gas molecules.

Purpose of the Study:

  • To demonstrate the capability of novel quantum cascade distributed feedback (QC-DFB) lasers for trace gas detection.
  • To quantify specific gases in ambient air using sensitive absorption spectroscopy.
  • To assess the selectivity and sensitivity of the QC-DFB laser system for ethanol vapor.

Main Methods:

  • Utilized pulsed and continuous-wave (cw) QC-DFB lasers operating around 8 micrometers.
Keywords:
NASA Discipline Life Sciences TechnologiesNon-NASA Center

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  • Employed sensitive absorption spectroscopy for gas analysis.
  • Calibrated the system for the detection and quantification of N2O, CH4 (12CH4, 13CH4), and H2O isotopes.

    • Main Results:

    • Successfully detected and quantified N2O, 12CH4, 13CH4, and various H2O isotopic species in ambient air.
    • Achieved highly selective detection of ethanol vapor.
    • Demonstrated a minimum detection sensitivity of 125 parts per billion by volume (ppb) for ethanol.

    Conclusions:

    • Novel QC-DFB lasers are effective tools for sensitive and selective trace gas detection in ambient air.
    • The developed spectroscopic method allows for the quantification of key atmospheric gases.
    • The system shows promise for environmental monitoring and industrial applications requiring low-level gas detection.