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    Researchers developed a new scheme to efficiently multiply the orbital angular momentum (OAM) of light by using a multiple-ring conformal mapping. This method overcomes efficiency losses caused by gaps in spiral structures, improving OAM mode conversion.

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    Area of Science:

    • Optics and Photonics
    • Quantum Information Science

    Background:

    • Spiral transformations are increasingly used for switching orbital angular momentum (OAM) modes.
    • Existing methods suffer from reduced efficiency due to gaps in spiral strip structures.

    Purpose of the Study:

    • To propose a novel multiple-ring conformal mapping scheme to enhance OAM multiplication efficiency.
    • To address the limitations of current spiral transformation techniques.

    Main Methods:

    • A multiple-ring conformal mapping scheme is introduced.
    • Input OAM modes are divided into concentric rings.
    • These rings are mapped to multiple sectors and reconnected into an output ring.

    Main Results:

    • The point-to-point mapping mechanism effectively avoids high-order diffraction generation.
    • High conversion efficiency in OAM multiplication is achieved.
    • The proposed scheme demonstrates significant improvement over existing methods.

    Conclusions:

    • The multiple-ring conformal mapping scheme offers an efficient solution for OAM multiplication.
    • This technique has potential applications in optical communication and quantum key distribution systems.
    • The method provides a pathway for developing advanced OAM-based technologies.