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    This study presents a two-stage Innoslab microsecond amplifier, achieving 303.6 W output power with 25.7% efficiency. Further improvements in pump overlap can enhance performance.

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    Area of Science:

    • Laser Physics
    • Photonics
    • Materials Science

    Background:

    • High-power, pulsed laser systems are critical for various scientific and industrial applications.
    • Microsecond amplifiers offer a balance between pulse energy and repetition rate.
    • Innoslab technology provides a compact and efficient platform for laser amplification.

    Purpose of the Study:

    • To report the development and performance of a two-stage, partially pumped Innoslab microsecond amplifier at 1064 nm.
    • To evaluate the optical-optical efficiency and beam quality of the developed amplifier.
    • To identify parameters for further performance enhancement.

    Main Methods:

    • Utilized a two-stage Innoslab architecture for amplification.
    • Employed a 4.4-W single-frequency seed laser at 1064 nm.
    • Characterized output power, optical-optical efficiency, pulse width, repetition rate, and beam quality (M^2).

    Main Results:

    • Achieved a maximum output power of 303.6 W from a 4.4-W seed laser.
    • Obtained an overall optical-optical efficiency of 25.7%.
    • Measured overlapping efficiencies of 67% (first stage) and 55.6% (second stage), with a pulse width of 145.0 µs at 500 Hz repetition rate and beam quality factors M^2 of 1.84 (horizontal) and 1.71 (vertical).

    Conclusions:

    • The two-stage Innoslab amplifier demonstrates high efficiency and good beam quality for microsecond pulse generation.
    • Optimizing the overlap between pump volume and seed laser mode is crucial for maximizing output power and efficiency.
    • This Innoslab amplifier is a promising technology for high-power laser applications.