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152 W average power Tm-doped fiber CPA system.

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    Researchers developed a high-power thulium-doped fiber chirped-pulse amplification system. This system achieved a record 152 W compressed average output power using large-mode-area fibers and efficient gratings.

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    Area of Science:

    • Laser Physics
    • Fiber Optics
    • Nonlinear Optics

    Background:

    • High-power fiber lasers are crucial for various applications.
    • Thulium-doped fiber systems offer unique wavelength advantages.
    • Nonlinear effects and thermal management are key challenges in high-power fiber amplifiers.

    Purpose of the Study:

    • To demonstrate a high-power thulium-doped fiber chirped-pulse amplification (TD-FCPA) system.
    • To achieve record-breaking compressed average output power.
    • To investigate the use of large-mode-area photonic crystal fibers for mitigating nonlinearities.

    Main Methods:

    • Utilized thulium-doped photonic crystal fibers with a 35 μm mode-field diameter.
    • Employed multilayer dielectric gratings with >98% diffraction efficiency for pulse compression.
    • Operated the system in a chirped-pulse amplification regime.

    Main Results:

    • Achieved a record compressed average output power of 152 W.
    • Demonstrated a peak power of 4 MW.
    • Observed slope efficiencies exceeding 50% and a pump-power-limited average output power of 241 W.
    • Successfully mitigated nonlinearities using large-mode-area fibers.

    Conclusions:

    • The developed TD-FCPA system represents a significant advancement in high-power fiber laser technology.
    • Large-mode-area Tm-doped photonic crystal fibers are effective in managing nonlinearities at high power levels.
    • High-efficiency dielectric gratings are essential for achieving high compression efficiency in pulsed systems.