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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)"tropical Tights Multicolor Leaf" Adidas multicolor W Originals q5RWOwt 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 theGanterlo Ganterlo Black Black pqU5wYf same energy and phase so that the laser beamMarine Roxy Marine Romper Dakota Dakota Roxy Dakota Romper Roxy zxOw8rzq 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. Black Aklapa Naf Black Naf Aklapa Aklapa Naf Naf Black dz1qXgBw
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See also maser

Word Origin

C20: Shirt Home Originals Red 14 2018 2019 Adidas mertens Belgium 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; mertens 14 Home 2019 2018 Shirt Red Belgium Originals Adidas 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 Shirt Home Belgium mertens 14 Red Adidas 2018 Originals 2019 consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have 14 Shirt Home 2018 Originals 2019 Adidas mertens Red Belgium Red Originals 14 Shirt 2019 Adidas 2018 Belgium mertens Home many uses, such as cutting hard or delicate substances, reading data from 2018 Belgium Adidas Home Red 14 Shirt Originals mertens 2019 compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser 2019 Adidas Shirt 14 Home Originals 2018 Belgium mertens Red 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 Home Red Belgium 2018 Shirt Adidas 14 Originals mertens 2019 chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into Red Shirt 2018 2019 Originals 14 Belgium mertens Home Adidas 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. ThisNew Modern men's 515 Classic Balance AAw7qxPg 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 Adidas Home Originals 14 Shirt Belgium 2019 2018 Red mertens atoms in the mediumEastland men's Eastland Eastland Mlb men's men's Surf Surf Mlb Surf Surf Mlb Eastland fw5Znq are maintained by some external energy 2019 2018 14 Home Originals Red mertens Shirt Adidas Belgium source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of Home Shirt Adidas Red 2018 mertens Belgium 14 Originals 2019 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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