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    Area of Science:

    • Atmospheric science
    • Spectroscopy
    • Laser technology

    Background:

    • Open-path gas sensing is crucial for environmental monitoring.
    • Chirped Laser Dispersion Spectroscopy (CLaDS) offers high sensitivity for gas detection.
    • Mid-infrared spectroscopy is effective for identifying various gases, including methane.

    Purpose of the Study:

    • To assess the feasibility of open-path methane detection at 3.4 μm using CLaDS.
    • To investigate the use of a nonlinear differential frequency generation (DFG) laser source for CLaDS.
    • To optimize CLaDS for atmospheric gas measurements requiring GHz modulation.

    Main Methods:

    • Implemented CLaDS with a DFG laser source operating at 3.4 μm.
    • Utilized telecom laser sources and modulators for GHz modulation.
    • Compared observed CLaDS signals with established spectroscopic models.

    Main Results:

    • Demonstrated the feasibility of open-path methane detection using the developed CLaDS system.
    • Achieved excellent agreement between experimental CLaDS signals and spectroscopic models.
    • Validated the optimization of the mid-infrared CLaDS system for atmospheric measurements.

    Conclusions:

    • The DFG-based CLaDS system is a viable method for open-path methane detection.
    • The system's performance is suitable for gas measurements under atmospheric conditions.
    • The study confirms the accuracy and reliability of the CLaDS technique for environmental monitoring.