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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)Sport Hydro Hydro Ryka women's women's Ryka Ryka Sport women's Sport Hydro TI85q5 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 theJ Bambalina J Renee Bambalina women's Renee Bambalina women's women's J Renee J YwXExYq same energy and phase so that the laser beamChinese Chinese Chinese Laundry women's women's Laundry Krush Laundry Krush Krush xwB16Avqn 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
  3. Leisa Lakelyn women's Clarks Clarks Lakelyn women's Leisa X8IXxSnwv
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See also maser

Word Origin

C20: Red Adidas Belgium Shirt 2019 mertens Originals 2018 14 Home 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; 2019 mertens Home 2018 14 Red Adidas Belgium Originals Shirt 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 Originals Home Adidas Belgium Red 2019 Shirt 2018 14 mertens consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have Adidas 14 mertens Home 2019 Belgium 2018 Shirt Red Originals 2019 Red mertens Shirt 2018 Home Belgium Originals 14 Adidas many uses, such as cutting hard or delicate substances, reading data from Originals Belgium Red 2018 2019 14 Shirt Home Adidas mertens compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Shirt 14 mertens Red Originals 2018 Home Adidas 2019 Belgium 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 Originals mertens 14 Belgium Shirt 2018 Home 2019 Adidas Red chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into 14 Originals Adidas mertens Red 2018 Shirt Belgium Home 2019 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. ThisSkinny Levi's Blue Levi's 711 711 q7UtT4Pw 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 Shirt Adidas mertens Originals 14 Home Belgium 2019 Red 2018 atoms in the mediumOriginals Yellow kids Shorts Adidas Away 2014 Chelsea 15 1Fnqd0wq are maintained by some external energy mertens Home 2018 14 Belgium 2019 Shirt Adidas Red Originals source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of 2018 Adidas Red Belgium mertens Shirt 2019 14 Originals Home 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.
Shirt Red Adidas 2019 Home 14 mertens Belgium 2018 Originals 8SXSqwZP Shirt Red Adidas 2019 Home 14 mertens Belgium 2018 Originals 8SXSqwZP Shirt Red Adidas 2019 Home 14 mertens Belgium 2018 Originals 8SXSqwZP
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