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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

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Related Experiment Video

Updated: Jun 13, 2026

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
06:57

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon

Published on: July 17, 2020

Thermal design for germanium acoustooptic modulators.

A J Fox

    Applied Optics
    |May 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Germanium acoustooptic modulators for CO(2) lasers have thermal limits. This study identifies heat sources and determines temperature distribution and runaway thresholds for laser radar applications.

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    Area of Science:

    • Optoelectronics
    • Laser Technology
    • Materials Science

    Background:

    • Germanium acoustooptic modulators are crucial for modulating CO(2) laser output in laser radar.
    • Increasing CO(2) laser power necessitates understanding modulator thermal and optical limits.

    Purpose of the Study:

    • To describe optical and acoustic absorption in germanium.
    • To identify heat sources in acoustooptic modulators, especially transducer loss.
    • To determine temperature distribution and runaway thresholds in germanium acoustooptic modulators.

    Main Methods:

    • Analysis of optical and acoustic absorption phenomena in germanium.
    • Identification and quantification of heat generation sources.
    • Modeling of thermal distribution and runaway threshold determination.

    Main Results:

    • Optical and acoustic absorption phenomena in germanium are detailed.
    • Transducer loss is identified as a significant heat source.
    • Temperature distribution and runaway thresholds were calculated for a typical modulator.

    Conclusions:

    • Understanding thermal limits is essential for high-power CO(2) laser applications.
    • The methods described allow for the prediction of thermal behavior and failure points.
    • The Mullard AOM 100 acoustooptic modulator's thermal performance was analyzed as a case study.