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Trace gas detection using 1.3-microm InGaAsP diode laser transmitter modules.

D T Cassidy

    Applied Optics
    |June 5, 2010
    PubMed
    Summary

    This study demonstrates that InGaAsP diode lasers can detect small absorptions using a laser absorption spectrometer (LAS). The system achieved minimum detectable absorption of ~5 x 10(-5), suitable for trace gas monitoring.

    Area of Science:

    • Spectroscopy
    • Laser Technology
    • Atmospheric Science

    Background:

    • InGaAsP diode laser transmitter modules are typically used in optical communication systems.
    • These modules operate at 1.3 micrometers and feature single-mode-fiber pigtails for light coupling.
    • Laser absorption spectrometry (LAS) is a technique for detecting and quantifying substances.

    Purpose of the Study:

    • To investigate the detection of small absorptions using a laser absorption spectrometer (LAS) based on InGaAsP diode laser transmitter modules.
    • To determine the minimum detectable absorption achievable with this setup.
    • To assess the suitability of the 0.7-1.6 micrometer spectral region for trace gas detection.

    Main Methods:

    • Utilized InGaAsP diode laser transmitter modules, commonly found in optical communication systems.

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  • Employed harmonic detection and sweep integration techniques within the LAS.
  • Analyzed the spectral region between 0.7-1.6 micrometers for suitable absorption lines.

    • Main Results:

    • Achieved a minimum detectable absorption of approximately 5 x 10(-5) with harmonic detection.
    • Obtained a minimum detectable absorption of approximately 1 x 10(-4) with sweep integration.
    • Identified reflections from the fiber pigtail as the primary noise source.

    Conclusions:

    • The InGaAsP-based LAS demonstrates high sensitivity for detecting small absorptions.
    • Sufficient strong, isolated absorption lines exist in the 0.7-1.6 micrometer range for atmospheric trace gas monitoring.
    • The developed LAS system is viable for trace gas detection and monitoring applications.