Technician testing a laser diode module

Technician testing a laser diode module

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Credit: BRIAN BELL/SCIENCE PHOTO LIBRARY

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Caption: Technician testing a laser diode module. A laser diode is made of two layers of semiconducting material impregnated with impurities that create opposite electrical properties. Passing an electric current through the diode produces a laser beam. The colour of the laser depends upon the semiconducting material used. This laser diode is produced by Photonic Products Ltd.

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