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Updated: Aug 26, 2025

Writing Bragg Gratings in Multicore Fibers
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Programmable high-order mode control method based on acoustically induced fiber grating.

Haocun Wu, Jiangtao Xu, Yi Zhu

    Optics Express
    |October 13, 2022
    PubMed
    Summary
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    We present a new method for controlling high-order modes in high-power fiber lasers. This technique enables stable and switchable mode patterns, advancing applications in optical tweezers and laser material processing.

    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • High-power fiber lasers are crucial for various applications.
    • Precise control over laser beam modes is essential for advanced functionalities.

    Purpose of the Study:

    • To demonstrate a programmable method for controlling high-order modes in high-power fiber lasers.
    • To achieve stable and dynamically switchable mode patterns.

    Main Methods:

    • Utilizing a mode-locked fiber laser operating in the dissipative soliton resonance regime.
    • Employing an acoustically-induced fiber grating for mode conversion from fundamental (LP01) to high-order modes (LP11a/b).
    • Analyzing mode components using an optical 4f system and a mode decomposition algorithm.

    Main Results:

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    • Achieved 2 W average-power mode-locked pulses.
    • Demonstrated full or partial conversion of the fundamental mode to high-order modes.
    • Observed stable and dynamically switchable mode patterns.

    Conclusions:

    • The developed method offers programmable high-order mode control in high-power fiber lasers.
    • This technique is expected to have significant applications in optical tweezers, fiber communication, and laser material processing.