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Distributed active phase-locking of an all-fiber structured laser array by a stochastic parallel gradient descent

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    This summary is machine-generated.

    This study introduces an all-fiber coherent beam combining (CBC) method for high-power fiber laser arrays. It achieves effective phase control using distributed phase-locking and a stochastic parallel gradient descent algorithm.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Fiber Optics

    Background:

    • High output power in fiber laser arrays is crucial for various applications.
    • Coherent beam combining (CBC) is a key technology for achieving high power.
    • Existing CBC methods often rely on free-space optics, limiting scalability and integration.

    Purpose of the Study:

    • To develop an all-fiber structured CBC method.
    • To enable efficient phase control for fiber laser arrays without free-space optics.
    • To overcome limitations of current CBC techniques regarding array size and integration.

    Main Methods:

    • Implemented a novel all-fiber measurement loop alongside the main laser chain.
    • Utilized distributed phase-locking to indirectly control the phase of each laser.
    • Employed the stochastic parallel gradient descent (SPGD) algorithm for phase locking.
    • Performed simulations and experimental validation with a two-channel fiber laser system.

    Main Results:

    • Successfully demonstrated effective phase-locking in an all-fiber CBC system.
    • Observed stable and distinct interference fringes, confirming successful coherent combining.
    • Validated the feasibility of the proposed distributed phase-locking principle.
    • Showcased the straightforward construction and expandability of the proposed structure.

    Conclusions:

    • The developed all-fiber CBC method with distributed phase-locking is effective for high-power fiber laser arrays.
    • This approach overcomes the integration and scalability limitations of free-space optics-based CBC.
    • The proposed technique offers a promising and practical solution for advanced laser systems.