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Complex beam shaping by cascaded conical diffraction with intercalated polarization transforming elements.

Sali Mohammadou, Ballo Mohamadou, Germano Montemezzani

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    This study analyzes cascaded conical diffraction using optical elements between biaxial crystals. The method creates complex vector beams and allows for rapid beam shape switching with tunable elements.

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    Area of Science:

    • Optics and Photonics
    • Diffraction Theory
    • Vector Beam Generation

    Background:

    • Understanding light polarization and beam shaping is crucial for advanced optical applications.
    • Cascaded diffraction systems offer complex light manipulation possibilities.

    Purpose of the Study:

    • To theoretically analyze cascaded conical diffraction with intercalated polarization-modifying elements.
    • To experimentally validate the theoretical framework for generating vector beams.

    Main Methods:

    • Theoretical analysis using paraxial diffraction theory.
    • Experimental verification with a two-crystal cascade, polarizer, and wave plate.
    • Investigation of optical elements for local polarization control.

    Main Results:

    • Derived expressions for cascaded conical diffraction.
    • Confirmed experimental realization of complex vector beams with modulated azimuthal intensity.
    • Demonstrated the potential for creating concentric ring structures.

    Conclusions:

    • The developed approach enables the generation of diverse vector beams with intricate intensity profiles.
    • Fast switching of beam shapes is achievable using electro-optically tunable elements.
    • This research provides a pathway for novel optical beam manipulation techniques.