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Frequency-doubled Q-switched 4 × 4 multicore fiber laser system.

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    A Q-switched Yb-doped multicore fiber laser achieved 52% second harmonic generation efficiency using lithium triborate. This fiber laser architecture offers high energy capacity and may replace bulk systems for pumping high-energy lasers.

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    Area of Science:

    • Lasers and Photonics
    • Nonlinear Optics
    • Fiber Optics

    Background:

    • High-energy lasers are crucial for scientific research and industrial applications.
    • Conventional bulk solid-state lasers face limitations in energy scaling and efficiency.
    • Fiber laser technology offers advantages in beam quality, thermal management, and scalability.

    Purpose of the Study:

    • To demonstrate frequency doubling of a Q-switched Yb-doped multicore fiber (MCF) laser.
    • To achieve high second harmonic generation (SHG) efficiency and pulse energy.
    • To evaluate the potential of MCF lasers as pump sources for high-energy systems.

    Main Methods:

    • Utilized a Q-switched Yb-doped 4x4 MCF laser system.
    • Employed type I non-critically phase-matched lithium triborate (LBO) for frequency doubling.
    • Operated the system at a 1 kHz repetition rate.

    Main Results:

    • Achieved a maximum SHG efficiency of 52%.
    • Obtained a total SHG pulse energy of up to 17 mJ.
    • Demonstrated the high energy capacity enabled by the dense parallel arrangement of amplifying cores.

    Conclusions:

    • The frequency-doubled MCF laser architecture is efficient and scalable.
    • This system offers a promising alternative to bulk solid-state lasers for pumping high-energy Ti:Sapphire lasers.
    • MCF lasers are suitable for high-repetition-rate and high-average-power applications.