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Manipulation of orbital angular momentum beams based on space diffraction compensation.

Hailong Zhou, Jianji Dong, Siqi Yan

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    We developed a novel technique to control the size of orbital angular momentum (OAM) beams using space diffraction compensation. This method allows for precise OAM beam size manipulation without altering the OAM state, enabling new applications.

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    Area of Science:

    • Optics and Photonics
    • Quantum Optics
    • Beam Shaping

    Background:

    • Orbital angular momentum (OAM) beams possess unique phase profiles.
    • Paraxial Fresnel diffraction introduces a negative spatial quadratic phase, acting as a negative diffractive effect.
    • Controlling OAM beam size is crucial for various optical applications.

    Purpose of the Study:

    • To introduce a technique for manipulating the size of OAM beams.
    • To compensate for negative diffraction effects in OAM beams.
    • To enable flexible control over OAM beam dimensions.

    Main Methods:

    • Utilizing space diffraction compensation.
    • Employing a 4f Fourier lens system with a phase mask.
    • Generating an inverse quadratic phase to counteract negative diffraction.

    Main Results:

    • The size of OAM beams can be precisely controlled by designing the phase mask profile.
    • The orbital angular momentum (OAM) state remains unchanged during size manipulation.
    • Demonstrated the feasibility of controlling OAM beam size.

    Conclusions:

    • The proposed space diffraction compensation technique offers effective control over OAM beam size.
    • This method is versatile and can be applied to OAM demultiplexing, ring fiber coupling, and optical manipulation.
    • The technique provides a new avenue for advanced optical beam engineering.