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Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Types of Semiconductors01:20

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
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The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Two-chip power-scalable THz-generating semiconductor disk laser.

Heyang Guoyu, Christian Kriso, Fan Zhang

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    We developed a compact terahertz laser source using a two-chip design and frequency conversion. This novel approach achieves 1 THz output, benefiting from high intracavity power for efficient operation.

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    Area of Science:

    • Optics and Photonics
    • Terahertz Science and Technology

    Background:

    • Terahertz (THz) radiation is crucial for various applications.
    • Compact and efficient THz sources are in high demand.

    Purpose of the Study:

    • To demonstrate a compact two-chip terahertz-emitting vertical-external-cavity surface-emitting laser (VECSEL) source.
    • To achieve 1 THz output power through intracavity frequency conversion.

    Main Methods:

    • Utilized a periodically poled lithium niobate crystal for type-I frequency conversion.
    • Employed a dual-wavelength emission scheme within a multi-chip VECSEL cavity.
    • Operated the system at room temperature.

    Main Results:

    • Achieved 1 THz output from the compact two-chip VECSEL source.
    • Demonstrated high intracavity powers exceeding 500 W.
    • Leveraged the benefits of type-I frequency conversion for power scaling.

    Conclusions:

    • The demonstrated two-chip VECSEL is a promising compact source for 1 THz radiation.
    • Intracavity frequency conversion in a multi-chip cavity enables efficient power scaling.
    • Room-temperature operation enhances the practicality of this THz source.