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Adaptive phase correction of dynamic multimode beam based on modal decomposition.

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    We developed a real-time adaptive phase correction method for dynamic multimode fiber beams. This technique significantly improves power delivery, showing feasibility for large mode area fiber lasers using adaptive optics.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Adaptive Optics

    Background:

    • Multimode fiber beams are challenging to control due to dynamic phase distortions.
    • Efficient delivery of light through multimode fibers requires precise phase management.
    • Adaptive optics offers potential solutions for real-time beam correction.

    Purpose of the Study:

    • To propose and demonstrate a novel method for adaptive phase correction of dynamic multimode fiber beams.
    • To achieve real-time phase reconstruction and correction using modal information.
    • To validate the method's effectiveness in improving power delivery.

    Main Methods:

    • Modal decomposition of correlation filter method for real-time modal information acquisition.
    • Computer-generated hologram encoded onto a phase-only spatial light modulator for simultaneous modal decomposition and phase correction.
    • Experimental setup to demonstrate phase correction of dynamic multimode beams.

    Main Results:

    • Successful real-time phase correction of dynamic multimode fiber beams demonstrated at 5 Hz.
    • Achieved a 1.73-fold improvement in average power-in-the-bucket.
    • Validated the feasibility of the proposed adaptive optics approach.

    Conclusions:

    • The developed method enables effective real-time adaptive phase correction for dynamic multimode fiber beams.
    • This technique shows significant potential for applications involving large mode area fiber lasers.
    • The study confirms the viability of adaptive optics for enhancing beam quality and power delivery in multimode fibers.