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Schottky Barrier Diode

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...

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Updated: Jun 19, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Two-mirror beam-shaping technique for high-power diode bars.

W A Clarkson, D C Hanna

|October 30, 2009

Summary

A novel beam-shaping technique reconfigures asymmetric laser sources into nearly circular beams. This method enhances brightness and beam quality for applications requiring focused laser output.

Area of Science:

Optics and Photonics
Laser Technology

Background:

High-power diode lasers exhibit high asymmetry, limiting their use in applications requiring well-defined beams.
Non-diffraction-limited sources pose challenges for beam shaping and focusing.

Purpose of the Study:

To present a simple beam-shaping technique for highly asymmetric laser sources.
To achieve equal beam-quality factors in orthogonal planes without significant brightness loss.

Main Methods:

Utilizing a simple beam-shaping technique on a high-power diode bar laser.
Employing conventional lenses in conjunction with the beam-shaping method.
Characterizing the focused beam's diameter and far-field divergence.

Main Results:

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Last Updated: Jun 19, 2026

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Reconfigured output from a 20-W continuous-wave (cw) diode bar.

Achieved a nearly circular spot with a 1/e(2) beam diameter of approximately 100 micrometers.

Obtained a far-field beam divergence (half-angle) of approximately 0.2 radians.

Conclusions:

The described technique effectively reshapes asymmetric laser output.
Enables the creation of intense, nearly circular laser spots from diode bars.
Maintains high brightness and improves beam quality for practical applications.