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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...
Diode: Forward bias01:20

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...
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...
Diode: Reverse bias01:14

Diode: Reverse bias

A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
Zener Diodes01:16

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Zener diodes are specialized semiconductor devices designed to operate in the reverse breakdown region, where they allow current to flow into the cathode, making it positive relative to the anode. This reverse operation distinguishes Zener diodes from conventional diodes and enables their use in various applications, most notably as voltage regulators. One of the defining characteristics of Zener diodes is their nearly vertical I-V (current-voltage) characteristic curve above a certain...

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Published on: April 24, 2014

Tunable, Single-frequency, Diode-pumped 2.3mum VECSEL.

J-M Hopkins, A J Maclean, D Burns

    Optics Express
    |June 24, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrate a high-performance, directly diode-pumped Gallium Antimonide-based Vertical-External-Cavity Surface-Emitting Laser (VECSEL) operating at 2.3µm. This novel VECSEL achieves 70nm tunability and a maximum single-frequency output power of 0.68W.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Materials Science

    Background:

    • Vertical-External-Cavity Surface-Emitting Lasers (VECSELs) offer advantages in beam quality and power scaling.
    • Gallium Antimonide (GaSb)-based materials are crucial for mid-infrared laser applications.
    • Direct diode-pumping provides an efficient and compact excitation method for VECSELs.

    Purpose of the Study:

    • To report high-performance single-frequency operation of a directly diode-pumped GaSb-based VECSEL.
    • To investigate the tunability and output power characteristics of this novel laser system.
    • To demonstrate the potential of GaSb-based VECSELs for mid-infrared applications.

    Main Methods:

    • Fabrication of a GaSb-based VECSEL structure.
    • Direct diode-pumping using a tailored laser diode source.
    • Characterization of the VECSEL's spectral properties, tunability, and output power.

    Main Results:

    • Achieved single-frequency operation at 2.3µm.
    • Demonstrated a wide tunability range of 70nm.
    • Obtained a maximum single-frequency output power of 0.68W.

    Conclusions:

    • The directly diode-pumped GaSb-based VECSEL is a viable platform for high-performance mid-infrared laser generation.
    • This technology shows promise for applications requiring tunable, single-frequency emission.
    • Further optimization could lead to even higher output powers and broader tunability.