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Updated: Jun 12, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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3 kHz, 28.3 mJ, 65 ns, Q-switched Nd:YAG laser with Innoslab amplification.

Heqing Guo, Xiaomeng Liu, Tanghan Chen

    Optics Express
    |June 11, 2026
    PubMed
    Summary

    This study presents a laser diode-pumped Nd:YAG laser system that generates clean seed pulses and amplifies them efficiently using an Innoslab amplifier, achieving high pulse energy and excellent beam quality.

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    Area of Science:

    • Lasers and Photonics
    • Solid-State Lasers
    • Nonlinear Optics

    Background:

    • Developing high-energy, high-beam-quality pulsed lasers is crucial for various scientific and industrial applications.
    • Nd:YAG lasers are widely used due to their favorable properties, but achieving high pulse energy with good beam quality remains a challenge.
    • Acusto-optic Q-switching and Innoslab amplification are advanced techniques for laser pulse generation and energy scaling.

    Purpose of the Study:

    • To develop a stable and efficient laser diode-pumped Nd:YAG laser system for generating clean seed pulses.
    • To achieve efficient amplification of these seed pulses using an Innoslab amplifier for high output energy.
    • To characterize the performance of the amplified laser pulses, including energy, pulse width, and beam quality.

    Main Methods:

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    • Utilized a laser diode (LD) end-pumped Nd:YAG laser oscillator with acousto-optic Q-switching.
    • Implemented an intracavity mirror with 70% transmittance to suppress Q-switched mode-locking (QML).
    • Employed a double-pass Innoslab amplifier with a hybrid cavity configuration for energy scaling.

    Main Results:

    • Generated clean acousto-optic Q-switched seed pulses with 0.68 mJ energy and 65 ns pulse width at 3 kHz repetition rate.
    • Achieved a single pulse energy of 28.3 mJ from the Innoslab amplifier at an absorbed pump power of 305.3 W.
    • Obtained excellent beam quality factors (M² < 1.23) and a high optical-to-optical conversion efficiency of 27.5%.

    Conclusions:

    • The developed laser system effectively suppresses QML, providing stable and clean Q-switched pulses.
    • The Innoslab amplifier successfully scales the pulse energy while maintaining high beam quality.
    • This system offers a promising solution for applications requiring high-energy, high-quality pulsed laser sources.