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    Researchers developed a new method for controlling transverse modes in multi-mode fiber lasers. This technique enables fast switching between modes, achieving over 5 W output power for various laser modes.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Multi-mode fiber lasers offer potential for high-power output but controlling their transverse modes is challenging.
    • Existing methods for mode control often lack speed and electronic tunability.

    Purpose of the Study:

    • To present a novel technique for electronically-controllable generation and switching of transverse modes in a multi-mode fiber laser.
    • To demonstrate selective excitation and fast switching of specific transverse modes.

    Main Methods:

    • Development of an electronically-controlled system for mode manipulation within a fiber laser oscillator.
    • Application of the technique to a core-pumped Thulium-doped silica fiber laser with a multimode core.

    Main Results:

    • Selective excitation of the fundamental mode (LP₀₁) and higher-order modes (LP₁₁), including a donut-shaped superposition.
    • Achieved watt-level output powers exceeding 5 W for individual modes.
    • Demonstrated fast switching between LP₀₁ and LP₁₁ modes at frequencies up to 20 kHz.

    Conclusions:

    • The developed technique provides effective electronic control over transverse mode generation and switching in multi-mode fiber lasers.
    • This advancement enables high-power, fast-switching fiber laser systems with selectable transverse modes.