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    A novel gold-coated silicon grating efficiently separates mid-infrared beams from high-power near-infrared light. This thermally robust optic is crucial for advanced coherent mid-infrared radiation sources.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Laser Physics

    Background:

    • Coherent mid-infrared (MIR) radiation sources are vital for spectroscopy and sensing.
    • Parametric frequency downconversion of near-infrared (NIR) lasers is a key method for generating MIR light.
    • Efficient spatial separation of high-power NIR driving beams from generated MIR beams is a significant challenge.

    Purpose of the Study:

    • To develop a robust optical element for efficient spatial separation of broadband MIR beams from collinear NIR beams.
    • To enable spectral filtering at high powers for MIR radiation generation.
    • To demonstrate a thermally robust and chromatic-dispersion-free solution for MIR source applications.

    Main Methods:

    • Fabrication of a gold-coated silicon grating.
    • Characterization of the grating's performance in separating broadband MIR (>5 μm) from NIR (2 μm) light.
    • Testing the optic's ability to handle high average power (>20 W) NIR driving pulses.

    Main Results:

    • Demonstrated efficient spatial separation of broadband MIR beams from collinear NIR beams.
    • Achieved spectral filtering at high powers with a thermally robust and chromatic-dispersion-free optic.
    • Suppressed a >20 W average-power, 2 μm NIR driving pulse train by three orders of magnitude.
    • Maintained high reflectivity for the broadband MIR beam.

    Conclusions:

    • The developed gold-coated silicon grating is an effective solution for separating high-power NIR from MIR beams.
    • This optic is suitable for demanding applications, including coherent MIR radiation sources.
    • The grating offers a robust, high-performance component for advanced laser systems.