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Simply structured polarization-independent high efficiency multilayer dielectric gratings.

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    A novel polarization-independent diffraction grating achieves high efficiency and low aspect ratio. Heat treatment significantly improves its thermal stability under high laser power, crucial for optical applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Diffraction gratings are essential optical components.
    • Achieving high diffraction efficiency and polarization independence simultaneously is challenging.
    • Thermal stability under high laser power is critical for practical applications.

    Purpose of the Study:

    • To design and fabricate a polarization-independent multilayer dielectric diffraction grating.
    • To achieve a low aspect ratio and high diffraction efficiency.
    • To evaluate the thermal stability of the fabricated grating.

    Main Methods:

    • Design and simulation of a multilayer dielectric diffraction grating.
    • Fabrication using ion-assisted deposition and reactive ion etching.
    • Characterization of diffraction efficiency, polarization independence, and thermal stability under laser irradiation.

    Main Results:

    • The designed grating exhibited a low aspect ratio (0.59) and high polarization-independent diffraction efficiency (97.2%) in the 1030-1080 nm range.
    • The fabricated grating achieved a mean polarization-independent diffraction efficiency of 96.1% with a low standard deviation (0.68%).
    • Heat treatment at 400°C reduced the temperature variation under high laser power density from 8.8°C to 2.3°C.

    Conclusions:

    • A polarization-independent multilayer dielectric diffraction grating with excellent performance was successfully designed and fabricated.
    • The grating demonstrates high diffraction efficiency and low aspect ratio, suitable for demanding optical systems.
    • Heat treatment significantly enhances the thermal stability of the diffraction grating, enabling its use in high-power laser applications.