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Related Concept Videos

Schottky Barrier Diode01:27

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
The Ideal Diode01:15

The Ideal Diode

A diode is a semiconductor device that allows current to flow in one direction only, making it a crucial component in electronic circuits for controlling the direction of current flow. An ideal diode is a simplified version of a real diode used to understand how diodes work in circuits. It possesses two terminals: the positive anode and the cathode, which is negative. When a positive voltage is applied to the anode relative to the cathode, the diode is in a forward-biased state, allowing...
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Small-signal Diode Model

In analyzing the behavior of diodes in circuits, the relationship between the current through a diode and the voltage across it is of particular interest, especially when considering the effect of a direct current (DC) bias voltage. When applied, this DC bias influences the diode's operating point, known as the Q point, around which the current-voltage (I-V) characteristic of the diode exhibits exponential behavior. Introducing a small, time-varying signal on top of this bias aids in examining...
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Diode: Forward bias

In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
The behavior of a diode in forward bias...

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Diode-pumped miniature solid-state laser: design considerations.

K Kubodera, K Otsuka

    Applied Optics
    |February 23, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study explores miniaturizing solid-state lasers using LED-direct pumping. Numerical simulations show low threshold and pump power densities for efficient operation with neodymium-doped materials.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Miniaturization of solid-state lasers is a key goal in photonics.
    • LED-direct pumping offers a potential pathway for laser size reduction.

    Purpose of the Study:

    • To theoretically investigate LED-direct pumping for miniaturized solid-state lasers.
    • To calculate the pumping efficiency and required power densities for a specific laser material.

    Main Methods:

    • Numerical calculation of pumping efficiency using 3-D ray tracing.
    • Analysis of a lithium neodymium phosphate (LiNdP4O12) crystal, an efficient neodymium stoichiometric material.

    Main Results:

    • Calculated threshold power density: 20 W/cm².
    • Calculated pump power density for 5-mW output: 60 W/cm².
    • Assumed crystal dimensions: 50 µm x 50 µm x 5 mm.

    Conclusions:

    • LED-direct pumping is a viable theoretical approach for miniaturizing solid-state lasers.
    • Neodymium stoichiometric materials like LiNdP4O12 demonstrate high efficiency for this pumping method.