A laser diode is a laser where the active medium is a semiconductor similar to that found in a light-emitting diode. The most common and practical type of laser diode is formed from a p-n junction and powered by injected electrical current. These devices are sometimes referred to as injection laser diodes to distinguish them from optically pumped laser diodes, which are more easily produced in the laboratory.
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A laser that uses a forward-biased semiconductor junction as the active medium . Note: Stimulated emission of coherentlight occurs at a p-n junction where electrons and holes are driven into the junction. (188 ) Synonyms diode laser, laser diode, semiconductor laser. See figure on following page.
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