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    Researchers demonstrate the first cladding-pumped bismuth-doped fiber laser (BDFL), achieving 1440 nm emission. This novel fiber laser offers potential for improved power scaling and efficiency in laser technology.

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    Area of Science:

    • Photonics and Laser Technology
    • Optical Fiber Communications
    • Materials Science

    Background:

    • Bismuth-doped fiber lasers (BDFLs) offer potential for generating light in the near-infrared spectrum.
    • Cladding-pumped architectures can enhance pump absorption and power scalability compared to core-pumped systems.

    Purpose of the Study:

    • To demonstrate the first cladding-pumped bismuth-doped fiber laser (BDFL).
    • To characterize the performance of the developed BDFL, including emission wavelength, efficiency, and beam quality.
    • To discuss factors affecting efficiency and propose methods for power scaling.

    Main Methods:

    • Fabrication of a home-made Bi-doped germanosilicate fiber with a polymer-coated cladding.
    • Utilizing commercial 808 nm multimode laser diodes for pumping.
    • Implementing two cavity configurations: a free-running cavity and a cavity with a Bragg grating.

    Main Results:

    • Successful demonstration of a cladding-pumped BDFL emitting at 1440 nm.
    • Achieved a maximum output power of approximately 50 mW with a slope efficiency of 0.5% (with respect to absorbed pump power) in a Bragg-grating-based cavity.
    • Measured beam quality factors (M²) of 1.18 (horizontal) and 1.13 (vertical).

    Conclusions:

    • The cladding-pumped architecture is a viable approach for bismuth-doped fiber lasers.
    • The developed BDFL exhibits good beam quality, indicating potential for various applications.
    • Further research can focus on optimizing fiber design and cavity parameters for enhanced power and efficiency.