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Frequency resolved transverse mode instability in rod fiber amplifiers.

Mette Marie Johansen, Marko Laurila, Martin D Maack

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    Summary

    Transverse mode instabilities (TMIs) in fiber amplifiers were studied. Thermal annealing fully restored the TMI threshold, indicating a viable method for maintaining high-power fiber laser performance.

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    Area of Science:

    • Fiber optics
    • Laser physics
    • Nonlinear optics

    Background:

    • Transverse mode instabilities (TMIs) limit output power in high-power fiber amplifiers.
    • Understanding TMI dynamics is crucial for developing stable, high-power fiber laser systems.

    Purpose of the Study:

    • To investigate the frequency dynamics of TMIs in a single-pass amplifier setup.
    • To establish a simple method for determining the TMI threshold.
    • To explore methods for mitigating TMI onset and recovery.

    Main Methods:

    • Testing three 285/100 rod fibers in a single-pass amplifier.
    • Increasing pump power above the TMI threshold to observe output dynamics.
    • Utilizing standard deviation to determine the TMI threshold.
    • Applying thermal annealing at 300°C for 2 hours to the fiber output end.

    Main Results:

    • Stable operation up to ~200W of extracted output power was achieved without beam instabilities.
    • A TMI frequency component was observed appearing on top of system noise.
    • A decay of the TMI threshold with repeated testing was identified.
    • Thermal annealing fully recovered the TMI threshold to the level of pristine fiber.

    Conclusions:

    • The study provides insights into TMI frequency dynamics and threshold behavior.
    • Thermal annealing offers an effective method for restoring TMI threshold in fiber amplifiers.
    • These findings contribute to advancing high-power fiber laser technology.