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A laser is

[a]n assembly of components that produce both spatially and temporally coherent light that is amplified by stimulated emission of radiation.[1]


A laser is a device that emits light (electromagnetic radiation) through a process called stimulated emission. The term laser is an acronym for Light Amplification by Stimulated Emission of Radiation. Laser light is usually spatially coherent, which means that the light either is emitted in a narrow, low-divergence beam, or can be converted into one with the help of optical components such as lenses.


  1. U.S. Export Administration Regulations, Part 772 (15 C.F.R. §772.1).

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