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Highly efficient and high-power yellow fiber laser.

Yamei Xu, Linyong Yang, Xuanxi Li

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    Researchers achieved record yellow laser power using a novel bi-directional pumping method in a Dysprosium-doped fiber laser. This advancement overcomes previous limitations, paving the way for higher-power visible fiber lasers.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Balancing high-power output and simple structures in visible fiber lasers is challenging.
    • Traditional methods for visible fiber lasers are often costly and complex.

    Purpose of the Study:

    • Investigate the impact of pump source brightness and configurations on visible fiber laser performance.
    • Explore power scaling capabilities of fiber-based yellow lasers.

    Main Methods:

    • Utilized high-brightness pump lasers and counter-propagation pumping for initial optimization.
    • Introduced a novel bi-directional pump configuration for visible fiber laser generation.
    • Employed numerical simulations to predict performance with double-clad fibers.

    Main Results:

    • Achieved a maximal slope efficiency of 49.8% with counter-propagation pumping.
    • Demonstrated a record output power of 2.57 W at 575 nm using bi-directional pumping, more than doubling previous results.
    • Attained a laser slope efficiency of 40.6% with the bi-directional configuration.
    • Predicted a tenfold increase in output power using double-clad fibers via simulations.

    Conclusions:

    • The bi-directional pump configuration significantly enhances output power and thermal management in visible fiber lasers.
    • This study sets new records for power and slope efficiency in Dy3+-doped single-clad fiber lasers in the yellow region.
    • Future work with double-clad fibers holds potential for substantial further power scaling.