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Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
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Spatially-distributed orbital angular momentum beam array generation based on greedy algorithms and coherent

Tianyue Hou, Dong Zhi, Rumao Tao

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    A new method generates spatially-distributed orbital angular momentum (OAM) beam arrays using coherent combining. This technique allows for adjustable distances and has applications in optical communication and light structuring.

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    Area of Science:

    • Optics and Photonics
    • Quantum Optics

    Background:

    • Orbital angular momentum (OAM) beams offer unique properties for optical applications.
    • Generating structured light fields, such as OAM beam arrays, is crucial for advanced optical technologies.

    Purpose of the Study:

    • To present a novel approach for generating spatially-distributed orbital angular momentum (OAM) beam arrays.
    • To investigate the tunability and robustness of the generated OAM beam arrays.

    Main Methods:

    • Utilizing coherent combining technology to synthesize OAM beam arrays.
    • Employing the reversal of Huygens Fresnel diffraction and a greedy algorithm to determine beam arrangement, intensity weights, and phase distributions.
    • Investigating beam evolution properties near the receiver plane.

    Main Results:

    • Successfully generated a spatially-distributed OAM beam array at a specified, adjustable distance.
    • Demonstrated the tunability of the formation distance via phase modulation.
    • Analyzed experimental limitations including the number of beams, beam separation, and topological charges.

    Conclusions:

    • The proposed method effectively generates adjustable, spatially-distributed OAM beam arrays.
    • This technique holds promise for applications in optical communication and spatial light structuring.
    • The study provides insights into the practical implementation and limitations of OAM beam array generation.