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    This study presents a stable quantum cascade laser (QCL) for spectroscopy. The sampled grating QCL demonstrates high spectral tuning stability, making it ideal for sensitive molecular measurements.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Quantum Cascade Lasers

    Background:

    • Stable laser operation and predictable tuning are essential for laser spectroscopy.
    • Quantum cascade lasers (QCLs) are widely used in various spectroscopic applications.

    Purpose of the Study:

    • To report a sampled grating quantum cascade laser (QCL) with high spectral tuning stability.
    • To determine the conditions for predictable tuning behavior by suppressing undesired lasing modes.
    • To demonstrate the suitability of sampled grating QCLs for high-precision molecular spectroscopy.

    Main Methods:

    • Fabrication and characterization of a sampled grating quantum cascade laser (QCL).
    • Determination of the minimum loss margin required for stable single-mode operation.
    • Quantification of power fluctuations and drift using Allan deviation measurements.
    • Construction of a transmission spectroscopy setup to test the QCL's performance.

    Main Results:

    • The sampled grating QCL exhibited high spectral tuning stability across its entire tuning range.
    • The minimum loss margin necessary to suppress unwanted modes and ensure predictable tuning was identified.
    • Allan deviation measurements confirmed low power fluctuations and drift, indicating device stability.
    • Successful demonstration of high-precision molecular spectroscopy using the developed QCL.

    Conclusions:

    • Sampled grating QCLs offer predictable tuning behavior and stable operation.
    • These QCLs are suitable light sources for highly sensitive and precise spectroscopy.
    • The findings pave the way for advanced molecular sensing applications using QCL technology.