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Active coherent beam combining and beam steering using a spatial mode multiplexer.

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    Researchers achieved high-efficiency coherent beam combination of 12 fibers using a Multi-Plane Light Converter. This method also demonstrated novel beam steering capabilities for high-power fiber lasers.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Single lasers face power limitations.
    • Coherent beam combination offers a solution for increasing laser power.

    Purpose of the Study:

    • To coherently combine 12 fiber lasers at 1.03 µm.
    • To achieve high combination efficiency and demonstrate beam steering.

    Main Methods:

    • Utilized a Multi-Plane Light Converter (MPLC).
    • Implemented a phase-locking setup for coherent combination.
    • Measured overall loss to determine combination efficiency.

    Main Results:

    • Achieved a combination efficiency of 70% in the fundamental Hermite-Gaussian mode.
    • Successfully demonstrated beam steering capability for the first time.
    • Coherently combined 12 fibers at 1.03 µm.

    Conclusions:

    • The MPLC is effective for high-efficiency coherent beam combination.
    • The system offers advanced beam steering functionalities.
    • This approach overcomes single laser power limitations.