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Multi-beam formation of a tiled fiber laser array with closed-loop control.

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    Researchers developed a new method for tiled fiber laser arrays to create multiple beams, overcoming previous limitations. This closed-loop steering control enables flexible multi-beam formation for diverse applications.

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    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Beam Control Systems

    Background:

    • Tiled fiber laser arrays offer power scaling and atmospheric turbulence mitigation.
    • Forming multiple beams from laser arrays is increasingly important for various applications.
    • Current tiled laser arrays are limited to single-beam output due to control algorithm constraints.

    Purpose of the Study:

    • To introduce a novel method for multi-beam formation using tiled fiber laser arrays.
    • To demonstrate closed-loop steering control for individual beamlet management.
    • To enable on-demand formation of multiple beams from a single array.

    Main Methods:

    • A tagging laser is divided and coupled into each beamlet.
    • Modulation of tagging laser pulses and synchronization with a far-field camera enable direct pointing measurement and individual control.
    • Beamlets are grouped and steered to common far-field positions for combined beam formation.

    Main Results:

    • Successfully demonstrated the formation of one, two, and three beams using the proposed method.
    • An experimental system with seven beamlets and an adaptive fiber collimator array was utilized.
    • Achieved precise control over individual beamlet pointing for multi-beam generation.

    Conclusions:

    • This work presents the first demonstration of closed-loop multi-beam formation with tiled fiber laser arrays.
    • The developed method overcomes limitations of previous single-beam approaches.
    • The technique offers a flexible and controllable solution for generating multiple laser beams on demand.