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    A novel polymer-based fiber cladding mode stripper (CMS) efficiently extracts high power from double-clad fibers. This optimized CMS enables the development of a high-power all-fiber thulium fiber laser.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • High-power fiber lasers require efficient management of cladding modes.
    • Existing cladding mode strippers (CMS) face challenges in power handling and thermal management.

    Purpose of the Study:

    • To develop and experimentally validate an optimized polymer-based fiber cladding mode stripper (CMS).
    • To enable distributed power extraction and temperature monitoring along the CMS length.
    • To facilitate the development of high-power all-fiber lasers.

    Main Methods:

    • Fabrication of a polymer-based CMS using a unique partial fiber stripping technique.
    • Utilizing a 400 µm double-clad fiber (DCF) as the base for the CMS.
    • Experimental characterization of power extraction and temperature distribution.

    Main Results:

    • The designed CMS successfully extracts 300 W of inner cladding power.
    • Achieved an attenuation coefficient of 18.8 dB.
    • Demonstrated a low temperature gradient of 0.17°C/watt along the CMS.
    • Successfully developed an all-fiber 150 W thulium fiber laser operating at 1.94 µm.

    Conclusions:

    • The optimized polymer-based CMS offers efficient power extraction and thermal management.
    • The partial fiber stripping method is effective for distributed power management.
    • The developed CMS is a key component for high-power all-fiber thulium lasers.