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1kW fiber-coupled pump-module at 976nm with 50% efficiency.

R H Chin, M Dogan, S Fulghum

    Optics Express
    |August 10, 2017
    PubMed
    Summary
    This summary is machine-generated.

    We developed a high-power fiber-coupled pump module delivering over 1kW of power. Six modules can create a 5-6kW Ytterbium-doped fiber amplifier, showcasing efficient laser technology.

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    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Materials Science

    Background:

    • High-power fiber lasers are crucial for industrial and scientific applications.
    • Efficient and scalable pump sources are needed to achieve higher output powers.
    • Current pump module technologies face limitations in power delivery and efficiency.

    Purpose of the Study:

    • To develop and characterize a novel fiber-coupled pump module for high-power fiber amplifiers.
    • To demonstrate the scalability of these pump modules for multi-kilowatt laser systems.
    • To assess the electrical-to-optical efficiency of the proposed pump module.

    Main Methods:

    • Design and fabrication of a fiber-coupled pump module emitting at 976nm.
    • Characterization of the module's output power, beam quality, and spectral properties.
    • Integration of multiple pump modules with a (6+1):1 multimode combiner.
    • Testing of a Yb-doped fiber amplifier system powered by the developed modules.

    Main Results:

    • The pump module delivers over 1kW of mode-stripped power at 976nm from a 225µm, 0.22NA fiber.
    • Electrical-to-optical efficiency reaches approximately 50% at 1kW output power.
    • A 5-6kW single-mode Yb-doped fiber amplifier was successfully enabled using six pump modules.

    Conclusions:

    • The developed fiber-coupled pump module represents a significant advancement in high-power laser pumping.
    • The modular design allows for scalable power delivery, enabling multi-kilowatt fiber amplifiers.
    • This technology offers a promising solution for applications requiring high-power, efficient, and compact laser sources.