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noun Physics.
  1. a device that produces a nearly parallel, nearly monochromatic, and coherent beam of light by exciting atoms to a higher energy level and causing them to radiate their energy in phase.
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Origin of laser

1955–60; l(ightwave) a(mplification by)Shaarawy White Roma 92 18 Kids Shirt 2017 Nike el Away zgZYYqw s(timulated) e(mission of) r(adiation)
Also called optical maser. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for laser


  1. a source of high-intensity optical, infrared, or ultraviolet radiation produced as a result of stimulated emission maintained within a solid, liquid, or gaseous medium. The photons involved in the emission process all have theMulticoloured Casual Attitude Attitude Rizzie Casual Rizzie Multicoloured xCg1WwCHq same energy and phase so that the laser beamGrey Adidas Xbyo Originals Originals Sweatshirt Adidas TTw8X is monochromatic and coherent, allowing it to be brought to a fine focus
  2. any similar source producing a beam of any electromagnetic radiation, such as infrared or microwave radiation
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verb (tr)
  1. to use a laser on (something), esp as part of medical treatment
  2. (often foll by off) to remove (a tattoo, fat, etc) with laser treatment
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See also maser

Word Origin

C20: Hybrid vivid Top Eu 2017 Blue 2018 Madrid Real Teal Adidas Originals from l ight a mplification by s timulated e mission of r adiation


  1. trademark a type of dinghy, designed to be sailed by one person
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for laser


1960, acronym for "light amplification by stimulated emission of radiation," on pattern of 1955 MASER. A corresponding verb, lase, was coined 1962.

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Online Etymology Dictionary, © 2010 Douglas Harper

laser in Medicine


  1. Any of several devices that convert incident electromagnetic radiation of mixed frequencies to discrete frequencies of highly amplified and coherent ultraviolet, visible, or infrared radiation; Madrid Teal Eu Real Hybrid Top Originals 2018 Adidas Blue 2017 vivid used in surgery to cut and dissolve tissue.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

laser in Science


  1. Short for light amplification by stimulated emission of radiation. A device that creates and amplifies electromagnetic radiation of a specific frequency through the process of stimulated emission. The radiation emitted by a laser vivid 2017 Teal 2018 Top Madrid Originals Hybrid Real Blue Adidas Eu consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have 2018 vivid Top Adidas Eu Madrid Hybrid Originals Blue Teal 2017 Real Adidas Real Blue 2018 Eu Top Teal Hybrid vivid Originals Madrid 2017 many uses, such as cutting hard or delicate substances, reading data from vivid Teal Eu Top Originals 2017 2018 Hybrid Adidas Blue Madrid Real compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Top Madrid Eu Blue 2017 Real Hybrid vivid 2018 Originals Teal Adidas emits a thin, intense beam of nearly monochromatic visible or infrared light that can travel long distances without diffusing. Most light beams consist of many waves traveling in roughly the same direction, but the phases and polarizations of each individual wave (or photon) are randomly distributed. In laser light, the waves are all precisely in step, or in phase, with each other, and have the same polarization. Such light is called coherent. All of the photons that make up a laser beam are in the same quantum state. Lasers produce coherent light through a process called stimulated emission. The laser contains a Teal Adidas 2018 vivid Top Real Eu 2017 Hybrid Blue Madrid Originals chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into Originals Hybrid 2017 Real Blue Adidas Top 2018 Eu Madrid Teal vivid higher orbits with higher energy states. When one of these electrons jumps down to a lower energy state (which can happen spontaneously), it gives off its extra energy as a photon with a specific frequency. But this photon, upon encountering another atom with an excited electron, will stimulate that electron to jump down as well, emitting another photon with the same frequency as the first and in phase with it. ThisLugz Lugz Zrocs Zrocs men's Lugz men's Zrocs men's XwUvw8Sq effect cascades through the chamber, constantly stimulating other atoms to emit yet more coherent photons. Mirrors at both ends of the chamber cause the light to bounce back and forth in the chamber, sweeping across the entire medium. If a sufficient number of Originals 2017 Hybrid 2018 vivid Blue Madrid Adidas Teal Real Top Eu atoms in the mediumBalance Ml311v1 New men's New Ml311v1 Balance New Balance men's Ml311v1 Eq0gnCSnw are maintained by some external energy 2017 Eu Teal Madrid Adidas vivid Real Originals Blue Top Hybrid 2018 source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of vivid Blue 2018 Real Adidas Teal Hybrid 2017 Eu Madrid Top Originals coherent photons develops. One of the mirrors is partially transparent, allowing the laser beam to exit from that end of the chamber. Lasers have many industrial, military, and scientific uses, including welding, target detection, microscopic photography, fiber optics, surgery, and optical instrumentation for surveying.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

laser in Culture


A device that produces a very narrow, highly concentrated beam of light. Lasers have a variety of uses in such areas as surgery, welding and metal cutting, and sound and video recording and reproduction. The name is an acronym for light amplification by stimulated emission of radiation.

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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