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    Researchers developed a hybrid laser system to boost femtosecond fiber amplifier energy. This Ytterbium-doped Yttrium Aluminum Garnet (Yb:YAG) crystal system achieved 3 mJ pulse energy, a significant advancement for high-power laser applications.

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    Area of Science:

    • Laser Physics
    • Materials Science

    Background:

    • High-power femtosecond fiber lasers are crucial for various applications.
    • Scaling output pulse energy from fiber amplifiers is a significant challenge.

    Purpose of the Study:

    • To significantly increase the output pulse energy of a state-of-the-art industrial high-power femtosecond fiber system.
    • To explore a hybrid-system approach using a Yb:YAG single crystal booster amplifier.

    Main Methods:

    • A hybrid system combining a femtosecond fiber laser with a Yb:YAG booster amplifier was investigated.
    • Passive divided-pulse amplification was implemented to further scale pulse energy.

    Main Results:

    • An average power of over 60 W was demonstrated at 100 kHz with 600 µJ pulse energy (400 fs duration).
    • Pulse energy was increased to 2.5 mJ (before compression) by reducing the repetition rate, limited by optical coating damage thresholds.
    • Passive divided-pulse amplification enabled safe operation at 3 mJ (before compression) and 2.3 mJ (after compression) with 520 fs pulse duration, yielding 4.4 GW peak power.

    Conclusions:

    • The hybrid Yb:YAG booster amplifier system effectively scales femtosecond fiber laser pulse energy.
    • Passive divided-pulse amplification is a viable strategy for achieving multi-millijoule pulse energies and gigawatt peak powers.