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Related Experiment Video

Updated: Oct 17, 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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Highly efficient actively Q-switched Nd:YAG laser.

Zhanda Zhu, Shiwei Lv, Hanyi Zhang

    Optics Express
    |October 7, 2021
    PubMed
    Summary
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    Researchers developed a novel Q-switched laser design achieving high efficiency. This new structure for neodymium-doped yttrium aluminum garnet (Nd:YAG) lasers offers record optical-to-optical conversion efficiency at the millijoule level.

    Area of Science:

    • Laser Physics
    • Materials Science

    Background:

    • Q-switched lasers are crucial for various applications.
    • Improving efficiency in high-energy pulsed lasers remains a challenge.

    Purpose of the Study:

    • To design a novel gain medium structure for high-efficiency Q-switched pulses.
    • To enhance pump light absorption and suppress parasitic oscillations.

    Main Methods:

    • Utilized an improved corner-side hybrid pump structure for Nd:YAG.
    • Incorporated a Samarium-doped YAG (Sm:YAG) layer around the active medium.
    • Achieved 13 passes of pump light through the active media.

    Main Results:

    • Demonstrated a high-efficiency actively Q-switched laser.

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    Last Updated: Oct 17, 2025

    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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  • Achieved a pulse energy of 104 mJ.
  • Obtained an optical-optical conversion efficiency of 30.5%.

    • Conclusions:

    • The novel gain medium structure significantly enhances laser efficiency.
    • The Sm:YAG layer effectively suppresses parasitic oscillation and amplified spontaneous emission (ASE).
    • This represents the highest reported optical-to-optical efficiency for actively Q-switched Nd:YAG lasers at the hundred millijoule level.