laser

n. (acronym of: Light Amplification by Stimulated Emission of Radiation) device which stimulates the atoms in a medium in order to increase electrical impulses and produce an intense concentrated beam of light

A laser is a mechanical device that produces coherent radiation. The term "laser" is an acronym: Light Amplification by Stimulated Emission of Radiation. A typical laser emits light in a narrow, low-divergence beam and with a well-defined wavelength (corresponding to a particular color if the laser is operating in the visible spectrum). This is in contrast to a light source such as the incandescent light bulb, which emits into a large solid angle and over a wide spectrum of wavelength. A laser consists of a gain medium inside an optical cavity, with a means to supply energy to the gain medium. The gain medium is a material (gas, liquid, solid or free electrons) with appropriate optical properties. In its simplest form, a cavity consists of two mirrors arranged such that light bounces back and forth, each time passing through the gain medium. Typically, one of the two mirrors, the output coupler, is partially transparent. The output laser beam is emitted through this mirror.
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Noun
1. an acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light
(synonym) optical maser
(hypernym) optical device
(part-holonym) photocoagulator

n. laser, device for increasing the intensity of light through radiation

n. laser, device which stimulates the atoms in a medium in order to increase electrical impulses and produce an intense concentrated beam of light