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    Area of Science:

    • Fiber optics
    • Laser technology
    • Materials science

    Background:

    • Development of all-fiber lasers is crucial for various applications.
    • Bismuth-doped optical fibers offer potential for novel laser sources.
    • 1.7 μm wavelength lasers are of interest for specific applications.

    Purpose of the Study:

    • To develop a watt-level all-fiber laser operating at 1.7 μm.
    • To investigate the performance characteristics of a bismuth-doped high-germania fiber laser.
    • To determine the optimal parameters for maximizing laser efficiency.

    Main Methods:

    • Utilized bismuth-doped high-germania optical fiber as the gain medium.
    • Operated the laser in a continuous-wave (CW) regime.
    • Systematically varied active fiber length and output mirror reflectivity.

    Main Results:

    • Achieved a watt-level output power.
    • Obtained a maximum slope efficiency of 33% with respect to launched pump power.
    • Characterized the dependencies of slope efficiency on fiber length and output mirror reflectivity.

    Conclusions:

    • Demonstrated the feasibility of a watt-level CW fiber laser at 1.7 μm using bismuth-doped fiber.
    • Identified key parameters influencing laser efficiency.
    • Provided insights for optimizing future fiber laser designs.