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Highly efficient reflective Dammann grating with a triangular structure.

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    A novel triangular reflective Dammann grating achieves high diffraction efficiency for TE polarization at 1064 nm. This optical element shows promise for high-power laser applications and reflective systems.

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    Area of Science:

    • Optics and Photonics
    • Nanotechnology
    • Materials Science

    Background:

    • Dammann gratings are crucial optical elements for beam splitting.
    • Efficient reflective gratings are needed for high-power laser systems.
    • Optimizing grating design for specific wavelengths and polarizations is essential.

    Purpose of the Study:

    • To design and fabricate a highly efficient reflective Dammann grating.
    • To achieve efficient operation at 1064 nm wavelength for TE polarization.
    • To explore the potential of triangular structures for grating applications.

    Main Methods:

    • Rigorous coupled wave analysis (RCWA) for grating design and analysis.
    • Particle swarm optimization (PSO) algorithms for property optimization.
    • Direct laser writing lithography for grating fabrication.

    Main Results:

    • A triangular reflective Dammann grating was successfully designed and fabricated.
    • The grating operates efficiently at 1064 nm for TE polarization under normal incidence.
    • Achieved a diffraction efficiency of over 86% (97.6% theoretical).
    • The 0th order was successfully cancelled, with the mechanism clarified by a simplified modal method.

    Conclusions:

    • The developed triangular reflective Dammann grating is a highly efficient optical element.
    • It demonstrates significant potential for use in high-power laser systems.
    • The design and fabrication methods are suitable for advanced optical applications.