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    We developed a low-cost, tunable mid-infrared (mid-IR) light source using spontaneous parametric down conversion (SPDC). This source achieves high spectral stability when operated above the SPDC threshold, enhancing spectroscopic applications.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Materials Science

    Background:

    • Mid-infrared (mid-IR) spectroscopy is vital for environmental monitoring and life sciences due to distinct molecular signatures.
    • Development of efficient light sources is crucial for advancing mid-IR applications.

    Purpose of the Study:

    • To develop and characterize a simple, low-cost, tunable mid-IR light source.
    • To investigate the spectral stability of the generated light.

    Main Methods:

    • Utilized spontaneous parametric down conversion (SPDC) in MgO-doped periodically poled lithium niobate (MgO:PPLN).
    • Employed a passively Q-switched laser for high-energy pump pulses at 1.03 µm.
    • Characterized pulse-to-pulse spectral stability at varying pump energies.

    Main Results:

    • A tunable mid-IR source covering 1.45 µm to 3.5 µm was successfully developed, extendable to 5 µm.
    • High pulse energy stability does not guarantee high spectral stability.
    • Improved spectral stability was observed when operating the SPDC source well above the threshold.

    Conclusions:

    • The developed SPDC source offers a cost-effective and tunable solution for mid-IR spectroscopy.
    • Optimizing pump energy is critical for achieving high spectral stability in SPDC sources.
    • This work contributes to the advancement of mid-IR spectroscopic techniques.