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    Area of Science:

    • Laser Physics
    • Spectroscopy
    • Optical Engineering

    Background:

    • Developing compact and stable light sources is crucial for gas spectroscopy.
    • Backward wave optical parametric oscillators (BWOPOs) offer unique properties for generating specific wavelengths.
    • Existing methods often require complex stabilization for precise spectral output.

    Purpose of the Study:

    • To demonstrate a novel 2.7 µm light source for CO2 and H2O vapor spectroscopy.
    • To characterize the performance of a BWOPO for spectroscopic applications.
    • To explore the potential of BWOPOs for differential absorption lidar (DIAL) systems.

    Main Methods:

    • Utilizing the backward propagating wave of a BWOPO.
    • Employing a multi-longitudinal mode Q-switched pump laser at 1030 nm.
    • Developing novel methods for linewidth and wavelength stability measurements using ambient air.

    Main Results:

    • Demonstrated a novel 2.7 µm light source with a central output at 2712 nm.
    • Achieved a temperature tuning rate of -1.77 GHz/K and an output pulse energy of 2.3 µJ.
    • Measured a narrow output linewidth of 43 pm and a stability of 65 MHz without active stabilization.

    Conclusions:

    • BWOPOs provide a robust and inherently stable platform for spectroscopic light sources.
    • The demonstrated 2.7 µm source is suitable for CO2 and H2O spectroscopy.
    • This technology holds significant potential for advancing differential absorption lidar (DIAL) systems.