Research topic:laser

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Find more facts and information on our topic page about laser

laser

World Encyclopedia | 2005 | © World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

laser (acronym for light amplification by stimulated emission of radiation) Optical maser (microwave amplification), a source of a narrow beam of intense coherent light or ultraviolet or infrared radiation. The laser was invented in 1960 by US physicist Theodore H. Maiman. The source can be a solid, liquid or gas. A large number of its atoms are excited to a higher energy state. One photon of radiation emitted from an excited atom then stimulates the emission of another photon, of the same frequency and direction of travel, which in turn stimulates the emission of more photons. The photon number multiplies rapidly to produce a laser beam of very high energy. It has applications in medicine, engineering, telecommunications, and holography.

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