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Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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Numerical simulation of the internal active phase-locking coherent beam combining system.

Kaikai Jin, Hongxiang Chang, Jinhu Long

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    |September 14, 2023
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    Summary

    Coherent beam combining (CBC) of fiber lasers uses internal phase control for high output power and beam quality. This technique enables compact, scalable systems capable of combining hundreds of laser beams effectively.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Fiber Laser Technology

    Background:

    • Coherent beam combining (CBC) is crucial for high-power fiber lasers with excellent beam quality.
    • Traditional phase control methods for CBC often use external beam splitters, limiting scalability and compactness.
    • Internal phase control offers a more integrated approach for phase-locking fiber laser arrays.

    Purpose of the Study:

    • To design and simulate a compact Coherent Beam Combining (CBC) system utilizing an internal phase-locking technique.
    • To investigate the effectiveness of cascaded techniques for enhancing phase control bandwidth in CBC systems.
    • To demonstrate the potential for combining a large number of laser beams using the proposed internal phase control method.

    Main Methods:

    • Design of a novel CBC system incorporating an internal phase-locking mechanism.
    • Numerical simulations to analyze phase mismatch and control dynamics.
    • Application of cascaded techniques to increase phase control bandwidth.
    • Modeling of systems for combining hundreds of individual fiber laser beams.

    Main Results:

    • The internal phase-locking technique allows for phase mismatch information acquisition before free-space output.
    • Cascaded techniques significantly increase the phase control bandwidth.
    • Numerical simulations confirm the effective combination of hundreds of laser beams.
    • The proposed method is compact and scalable for larger laser arrays.

    Conclusions:

    • The developed internal phase control technique is a viable and effective method for compact, scalable Coherent Beam Combining (CBC) systems.
    • The simulation results provide a strong foundation for the practical design and implementation of advanced CBC systems.
    • This approach offers a significant advancement in achieving high-power, high-quality laser beams through fiber laser aggregation.