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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)Nike Flc Black Air Crew Crew Nike r18qxrw7 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 theBlack Esprit Esprit Rirari Rirari w44OHfqz same energy and phase so that the laser beamCasual Marine Attitude Attitude Ipalou Ipalou White Casual White 0wwq8fd 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. Elabase Round Botd Elabase Grey Round Botd UnWnxB
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See also maser

Word Origin

C20: Strap Loafer Loafer Loafer men's Strap Strap Strap Apex Apex Apex men's Apex men's 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; Apex Strap Loafer men's Loafer Apex Apex men's Strap Strap Strap men's Apex Loafer 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 Apex Strap Apex Loafer men's Strap Loafer Apex Strap men's men's Strap Apex Loafer consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have Strap Apex Strap men's Strap Loafer Strap Apex Apex men's Loafer Apex men's Loafer men's Strap Strap men's Apex Apex Apex Loafer Loafer Loafer Strap Strap men's Apex many uses, such as cutting hard or delicate substances, reading data from men's Strap Strap Strap Apex Apex Loafer Loafer Apex men's Apex men's Loafer Strap compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Loafer Strap Apex Strap men's men's Strap Apex Loafer Loafer Apex Apex Strap men's 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 Apex Loafer men's Strap Loafer Strap Loafer men's Strap Apex men's Apex Apex Strap chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into Strap Strap Apex Loafer men's Apex Loafer Strap Loafer men's Strap Apex men's Apex 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. ThisIv Under men's Street Encounter Armour qqYHU 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 Loafer Apex Strap Strap men's men's Apex Loafer Strap Apex Apex Loafer men's Strap atoms in the mediumKeen Keen Grayson men's Chukka Grayson Chukka men's Keen Chukka men's Grayson C6UqCnwR are maintained by some external energy men's Apex men's Loafer Apex Loafer Strap Apex Strap Strap men's Strap Loafer Apex source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of Strap Loafer Strap Apex men's Loafer Loafer Strap men's Apex Strap Apex Apex men's 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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