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    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Fractional vortex beams are crucial for applications like optical imaging and communication.
    • Generating high average power fractional vortex beams presents a significant technical challenge.

    Purpose of the Study:

    • To propose and experimentally demonstrate a high average power, mode-tunable fractional vortex beam generator.
    • To overcome the limitations of current methods for generating high-power structured light.

    Main Methods:

    • Utilized an internally sensed coherent beam combining (CBC) system.
    • Employed programmable liquid crystals (LCs) for real-time topological charge tuning.
    • Demonstrated a fractional vortex beam copier and array generation capability.

    Main Results:

    • Successfully generated a 1.5 kW continuous wave fractional vortex beam, a first to our knowledge.
    • Achieved real-time tuning of topological charge from -2/3 to +2/3.
    • Demonstrated the transformation of generated beams into fractional vortex beam arrays.

    Conclusions:

    • The developed system provides a viable solution for generating high average power fractional vortex beams.
    • This advancement facilitates practical implementation of high-power structured light in various fields.
    • The mode-tunable and array generation capabilities offer enhanced flexibility for optical applications.