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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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High efficiency Yb:YAG crystalline fiber-waveguide lasers.

Xiaodong Mu, Stephanie Meissner, Helmuth Meissner

    Optics Letters
    |November 1, 2014
    PubMed
    Summary

    Researchers demonstrated a novel Yb:YAG crystalline fiber waveguide laser. This laser achieved 13.2 W output power with near diffraction-limited beam quality, showcasing efficient laser performance.

    Area of Science:

    • Laser Physics and Photonics
    • Materials Science
    • Optical Engineering

    Background:

    • Development of high-power, high-beam-quality lasers is crucial for various scientific and industrial applications.
    • Crystalline fiber waveguides (CFWs) offer advantages in heat dissipation and beam quality compared to bulk lasers.
    • Yb:YAG is a well-established gain medium for near-infrared lasers.

    Purpose of the Study:

    • To demonstrate a cladding-pumped single-mode Yb:YAG CFW laser.
    • To investigate the performance of a core-pumped Yb:YAG CFW laser.
    • To achieve high output power and excellent beam quality from Yb:YAG CFWs.

    Main Methods:

    • Fabrication of an adhesive-free bonded 40 μm core Yb:YAG CFW.
    • Cladding pumping of the Yb:YAG CFW using a laser diode (LD).

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  • Core pumping of a single-clad Yb:YAG CFW using a laser diode (LD).

    • Main Results:

    • Achieved 13.2 W laser output power at 1.03 μm with 33.4% efficiency for the cladding-pumped configuration.
    • Measured near diffraction-limited beam quality with M2 = 1.02.
    • Demonstrated a core-pumped Yb:YAG CFW laser with 28 W output power and 78% slope efficiency, exhibiting a top-hat beam profile.

    Conclusions:

    • The demonstrated Yb:YAG CFW lasers show significant potential for high-power and high-beam-quality laser generation.
    • Cladding pumping offers a path to near diffraction-limited beam quality, while core pumping achieves higher output power and efficiency.
    • Adhesive-free bonding is a viable technique for fabricating high-performance crystalline fiber waveguides.