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MOSFET Amplifiers01:17

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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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High power single-frequency Innoslab amplifier.

Ke-Zhen Han, Jian Ning, Bai-Tao Zhang

    Applied Optics
    |July 14, 2016
    PubMed
    Summary
    This summary is machine-generated.

    A novel Innoslab amplifier achieved 60 W output power with a 44 MHz linewidth. This continuous-wave, single-frequency amplifier demonstrates high optical-optical efficiency and excellent beam quality for laser applications.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Materials Science

    Background:

    • Continuous-wave (CW) single-frequency lasers are crucial for various scientific and industrial applications.
    • Innoslab amplifiers offer a compact and efficient platform for high-power laser generation.
    • Developing advanced laser systems requires precise modeling and experimental validation.

    Purpose of the Study:

    • To demonstrate a laser diode array (LDA) end-pumped, continuous-wave, single-frequency Innoslab amplifier.
    • To model light propagation within the Innoslab amplifier using the Gaussian ray bundle method.
    • To characterize the amplifier's output power, linewidth, beam quality, and stability.

    Main Methods:

    • Utilized a laser diode array (LDA) for end-pumping.
    • Employed the Gaussian ray bundle method for light propagation modeling.
    • Integrated discrete reflectors to optimize amplifier performance.
    • Measured output power, linewidth, beam quality (M²), and power instability.

    Main Results:

    • Achieved a maximum output power of 60 W with a linewidth of 44 MHz.
    • Obtained an optical-optical efficiency of 24.5% under 245 W pump power.
    • Measured beam quality factors M² of 1.4 (horizontal) and 1.3 (vertical) at 51 W output.
    • Demonstrated long-term power instability of less than 0.25% over 2 hours.

    Conclusions:

    • The demonstrated Innoslab amplifier meets requirements for high-power, single-frequency laser output.
    • The Gaussian ray bundle method provides an effective approach for modeling Innoslab amplifiers.
    • The system exhibits excellent efficiency, beam quality, and stability for demanding laser applications.