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High-power 970 nm semiconductor disk laser.

Zhicheng Zhang, Yao Xiao, Jun Wang

    Optics Express
    |January 5, 2024
    PubMed
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    High-power semiconductor disk lasers (SDLs) were optimized for performance. Continuous wave operation achieved 70.3 W, while quasi-continuous wave pumping yielded 138 W peak power.

    Area of Science:

    • Optoelectronics
    • Laser Physics
    • Materials Science

    Background:

    • Semiconductor disk lasers (SDLs) represent a cutting-edge laser technology.
    • Optimizing SDL performance is crucial for advanced applications.
    • Understanding thermal characteristics is key for high-power operation.

    Purpose of the Study:

    • To enhance the performance of a 970 nm semiconductor disk laser.
    • To investigate thermal properties and optimize operational parameters.
    • To achieve record power and energy outputs in SDLs.

    Main Methods:

    • Optimization of chip design, packaging, resonator, and pumping strategy.
    • Characterization of laser performance under continuous wave (CW) and quasi-continuous wave (QCW) pumping.

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  • Analysis of thermal resistance and efficiency.

    • Main Results:

    • Achieved 70.3 W CW output power with a thermal resistance of 0.49 K/W.
    • Maximum slope efficiency reached 58.2% with a low pump threshold of 1.83 kW/cm².
    • QCW pumping (11% duty cycle) resulted in 138 W peak power and 13.6 mJ pulse energy without thermal rollover.

    Conclusions:

    • The optimized 970 nm SDL demonstrates state-of-the-art power and energy capabilities.
    • These findings provide valuable insights into thermal management for high-power SDLs.
    • The results represent a significant advancement in SDL technology.