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Target-in-the-loop coherent beam combining based on an all-fiber structure.

Kaikai Jin, Wenchang Lai, Hongxiang Chang

    Optics Express
    |November 14, 2024
    PubMed
    Summary

    Target-in-the-loop (TIL) technique resolves phase ambiguity in all-fiber coherent beam combining (CBC). This method decouples phase noise and turbulence, enabling high-brightness laser output.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Fiber Optics

    Background:

    • Coherent beam combining (CBC) is crucial for high-brightness laser generation.
    • All-fiber phase control offers compact solutions but struggles with π phase ambiguity.
    • Existing methods require external mirrors, limiting scalability and robustness.

    Purpose of the Study:

    • To introduce and validate the target-in-the-loop (TIL) technique for all-fiber CBC.
    • To address and compensate for π phase ambiguity in all-fiber systems.
    • To decouple phase noise from amplifiers and atmospheric turbulence.

    Main Methods:

    • Implementing a TIL feedback structure with external measurement laser channels.
    • Utilizing numerical simulations to demonstrate the principle of the proposed method.
    • Constructing and testing a six-channel TIL CBC system.

    Main Results:

    • Successful compensation of π phase ambiguity and low-intensity phase shifts.
    • Demonstration of decoupled phase noise and turbulence effects.
    • Validation of the TIL technique in a practical all-fiber CBC system.

    Conclusions:

    • The TIL technique effectively resolves phase ambiguity in all-fiber CBC.
    • The proposed system is scalable and compatible with high-power amplifiers.
    • This approach provides a significant reference for future TIL CBC system designs.