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    This study introduces a novel all-fiberized transverse mode-switching technique using temperature-controlled few-mode fiber Bragg gratings (FBGs). This method significantly boosts laser output power by switching between LP01 and LP11 modes.

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    Area of Science:

    • Photonics and Optical Engineering
    • Fiber Optics Technology
    • Laser Physics

    Background:

    • Mode switching in fiber lasers is crucial for advanced optical applications.
    • Previous methods for mode switching often suffer from low output power and complexity.
    • Few-mode fiber Bragg gratings (FBGs) offer potential for mode manipulation.

    Purpose of the Study:

    • To propose and demonstrate an all-fiberized transverse mode-switching method.
    • To achieve high-power laser output by switching between different spatial modes.
    • To leverage the temperature-dependence of FBGs for precise spectral tuning.

    Main Methods:

    • Fabrication of a few-mode (FM) FBG pair using two distinct fiber types.
    • Utilizing the temperature-dependence of FM FBGs to tune reflection spectra.
    • Implementing temperature control for switching between LP01 and LP11 modes in fiber lasers.

    Main Results:

    • Achieved 20 W level output power in both ytterbium-doped and Raman fiber lasers.
    • Demonstrated successful switching between LP01 and LP11 modes.
    • Output power is approximately two orders of magnitude higher than previous demonstrations (<100 mW).

    Conclusions:

    • The proposed all-fiberized mode-switching method is effective for high-power laser applications.
    • Temperature control of FM FBGs provides a robust mechanism for mode selection.
    • This technique significantly advances the capabilities of fiber laser systems.