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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Fuseless side-pump combiner for efficient fluoride-based double-clad fiber pumping.

Sébastien Magnan-Saucier, Simon Duval, Charles Matte-Breton

    Optics Letters
    |October 15, 2020
    PubMed
    Summary
    This summary is machine-generated.

    A new side-pumping technique for fluoride fibers achieves 93% coupling efficiency and 100 W power handling. This method simplifies fiber laser development for high-power mid-infrared applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • High-power fiber lasers are crucial for various applications.
    • Efficiently coupling pump light into fluoride-based double-clad fibers remains a challenge.

    Purpose of the Study:

    • To develop a novel, efficient, and simple technique for side-pumping fluoride-based double-clad fibers.
    • To demonstrate high power handling capabilities of the developed pump combiner.

    Main Methods:

    • A silica taper is wrapped around a fluoride fiber for side-pumping.
    • No complex fusion between dissimilar fibers is required.
    • Passive cooling was used for initial testing of pump combiners.

    Main Results:

    • A record coupling efficiency of 93% was achieved at 981 nm.
    • Maximum power handling near 100 W was demonstrated.
    • Pump combiners operated for several hours at 91 W (undoped) and 44 W (erbium-doped) under passive cooling.

    Conclusions:

    • The novel side-pumping technique offers a simple and effective solution for high-power fiber laser development.
    • This approach is key for advancing compact and robust mid-infrared fiber lasers and amplifiers.
    • Further investigation into heat management and active cooling strategies is discussed.