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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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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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1.2-kW all-fiber Yb-doped multicore fiber amplifier.

Luis F Ortega, Thomas Feigenson, Yin Wan Tam

    Optics Letters
    |February 1, 2023
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    Researchers achieved a record 1.2 kW output from an all-fiber multicore amplifier. This high-power fiber laser utilizes a novel six-core ytterbium-doped fiber and pump-signal combiner for efficient operation.

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    Area of Science:

    • Laser Physics
    • Optical Engineering
    • Materials Science

    Background:

    • High-power fiber lasers are crucial for various applications.
    • Scaling output power while maintaining beam quality is a significant challenge.
    • Multicore fiber technology offers a promising path for power amplification.

    Purpose of the Study:

    • To demonstrate a record-high power output from an all-fiber multicore amplifier.
    • To develop and utilize novel multicore fibers and pump-signal combiners for kW-class operation.
    • To explore the potential for further power scaling in fiber laser systems.

    Main Methods:

    • Development of double-clad six-core ytterbium-doped fibers with a 17-µm mode-field diameter and trench index profile.
    • Design and implementation of a multicore pump-signal combiner (PSC).
    • Characterization of the all-fiber multicore amplifier's output power and performance.

    Main Results:

    • Achieved a record output power of 1.2 kW from the all-fiber multicore amplifier.
    • The output power was limited by the available pump power of 1.9 kW.
    • Each of the six cores demonstrated kW-class operation capability.

    Conclusions:

    • The developed six-core fiber and PSC enable record high-power operation in an all-fiber amplifier.
    • The system demonstrates the viability of multicore fiber amplifiers for high-power laser generation.
    • Future advancements in thermal management and coherent beam combination could enable scaling to the 10-kW level.