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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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28-W, 217 fs solid-state Yb:CAlGdO4 regenerative amplifiers.

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    A novel ytterbium-doped calcium aluminum gadolinium oxide (Yb:CALGO) regenerative amplifier achieves high average power. This high-performance laser system demonstrates significant potential for advanced applications requiring powerful ultrashort pulses.

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    Area of Science:

    • Laser Physics
    • Materials Science

    Background:

    • High-performance regenerative amplifiers are crucial for scientific research and industrial applications.
    • Yb:CaAlGdO(4) (Yb:CALGO) is an emerging gain medium with promising optical properties.

    Purpose of the Study:

    • To demonstrate a high-performance regenerative amplifier based on the Yb:CALGO material.
    • To characterize the output performance of the Yb:CALGO regenerative amplifier.

    Main Methods:

    • A Yb:CALGO crystal was utilized as the gain medium in a regenerative amplifier setup.
    • The amplifier was pumped with a 116 W laser at approximately 980 nm.
    • Chirped and compressed pulses were generated and analyzed.

    Main Results:

    • The Yb:CALGO regenerative amplifier achieved an average output power of 36 W (chirped) and 28 W (compressed) at a 500 kHz repetition rate.
    • Compressed pulses reached an energy of 56 μJ and a peak power of 258 MW.
    • The compressed pulses had a time-bandwidth product of 0.69.

    Conclusions:

    • The demonstrated Yb:CALGO regenerative amplifier exhibits high-performance characteristics.
    • Further optimization of the compressor setup could lead to even shorter pulse durations.