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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Dark-state lasers: mode management using exceptional points.

H Hodaei, A U Hassan, W E Hayenga

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    Researchers developed a single-frequency microring laser using dark-state resonators. This semiconductor laser maintains single-mode operation and wide spectral tunability, even at high pump powers.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Micro-cavity Devices

    Background:

    • Dark-state resonators offer unique properties for light manipulation.
    • Achieving stable single-mode operation in micro-cavity lasers, especially at high pump powers, remains a challenge.
    • Mode selection is crucial for laser performance and tunability.

    Purpose of the Study:

    • To experimentally realize a single-frequency integrated microring laser system.
    • To investigate the use of dark-state resonators for mode selection.
    • To demonstrate wide spectral tunability and stable single-mode operation at high pump powers.

    Main Methods:

    • Utilizing the inherent characteristics of dark-state resonators.
    • Designing and fabricating an integrated microring laser system.
    • Experimentally evaluating the laser's mode stability and tunability under varying pump power levels.

    Main Results:

    • Successfully realized a single-frequency integrated microring laser.
    • The laser demonstrated stable single-mode operation across a wide spectral range, even at high pump power levels.
    • Exceptional points were shown to be effective for mode selection in this micro-cavity laser.

    Conclusions:

    • Dark-state resonators are a viable approach for achieving single-frequency operation in microring lasers.
    • The developed semiconductor laser system offers high performance and wide tunability.
    • Exceptional points present a promising strategy for advanced mode control in micro-cavity lasers.