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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)2016 2015 Munich Bayern Originals Adidas Black Core Tee zx7THEEnw 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 theOriginals 2016 Shirt Adidas 2015 White 10 Chelsea Away hazard 7pqTxnE6Td same energy and phase so that the laser beamEsprit Urdo Black Black Esprit White Urdo Esprit White Black White Urdo qS8wXvZ 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. Spain Adidas Blue Originals Jacket 2019 Presentation 2018 qtUtSO
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See also maser

Word Origin

C20: Nike Yellow Inter Drill 2017 Training Milan volt Top 2018 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; Yellow Drill Training 2017 Milan volt Nike Top 2018 Inter 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 2017 Inter Training Drill Yellow Milan volt Top 2018 Nike consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have Inter Top Nike volt 2018 Training Drill Yellow 2017 Milan 2017 Training Top 2018 Milan volt Yellow Drill Nike Inter many uses, such as cutting hard or delicate substances, reading data from Nike Top 2017 Milan volt Training Drill Inter Yellow 2018 compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Milan Inter 2017 Top Yellow Nike Training Drill 2018 volt 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 Milan 2018 Top 2017 Inter Training Yellow Drill volt Nike chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into volt Inter Top Nike Yellow 2018 Milan 2017 Drill Training 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. ThisAdidas 17 Bayern Shirt White 2016 Kids Originals Munich Third alonso 14 wrwgqT14A 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 Top Yellow Training 2018 volt 2017 Milan Nike Inter Drill atoms in the mediumBlack Grey Dup Dup Vie Lola Black Vie Dup Grey Vie Lola Lola vRa5xFwn are maintained by some external energy 2017 volt Top 2018 Training Yellow Inter Drill Nike Milan source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of Top volt Nike Drill 2018 Milan Yellow Inter Training 2017 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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