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Related Experiment Video

Updated: May 24, 2025

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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High-efficiency and high-brightness circular-clad, large-size, rectangular core crystalline waveguide Yb:YAG laser.

Shuai Li, Yukun Huang, Xiaolu Nie

    Optics Letters
    |February 28, 2025
    PubMed
    Summary

    Researchers developed a novel Yb:YAG crystalline waveguide laser with a unique circular-clad structure. This design enhances pump absorption and thermal management, achieving 110W average power with excellent beam quality.

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    Area of Science:

    • Laser Physics and Photonics
    • Materials Science
    • Optical Engineering

    Background:

    • High-power solid-state lasers are crucial for various applications.
    • Crystalline waveguides offer advantages in beam quality and thermal management.
    • Scaling power in large-mode-area waveguides is challenging due to thermal effects.

    Purpose of the Study:

    • To report a novel circular-clad large-size rectangular core crystalline waveguide Yb:YAG laser.
    • To improve pump absorption efficiency and overcome thermal lensing limitations.
    • To achieve high-power, high-beam-quality laser output.

    Main Methods:

    • Fabrication of a Yb:YAG rectangular core waveguide (400x400 μm) with an Er:YAG cladding.
    • Implementation of a circular-clad structure to enhance pump absorption.

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  • Design of a concave-convex cavity to mitigate thermal lens effects.

    • Main Results:

    • Achieved 110W average output power at 1030 nm.
    • Obtained excellent beam quality with M² factors of 1.07x1.05.
    • Demonstrated high optical-optical efficiency (54%) and slope efficiency (67%).

    Conclusions:

    • The circular-clad structure significantly improves pump absorption efficiency.
    • The concave-convex cavity effectively manages thermal lensing in large-core waveguides.
    • This Yb:YAG waveguide laser shows high potential for power scaling and pulse amplification.