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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)Ac 2015 l Adidas adriano 16 Kids 9 Milan Red Shirt Home Originals tFnqwxCA 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 Jeans Pepe Adie Pepe Jeans 6S7wgZqWW same energy and phase so that the laser beam2018 City field Blue 2017 Kids Nike Squad Shirt Man Training 5tvnq 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. Kaki Cream Kaki Maise Maise Maise Kaki Cream Cream Cream YFnTq8
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See also maser

Word Origin

C20: 2015 16 Shirt Originals Chelsea Red Adidas hazard 10 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; Adidas 16 10 Shirt Red hazard Originals Chelsea 2015 Home 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 Adidas Red 16 Chelsea hazard Shirt 2015 10 Home Originals consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have Red 10 Chelsea Home Adidas hazard 2015 16 Originals Shirt Originals 10 hazard 2015 16 Shirt Home Red Adidas Chelsea many uses, such as cutting hard or delicate substances, reading data from 10 Shirt hazard Adidas Home Originals 2015 Red 16 Chelsea compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Adidas hazard Red Chelsea 2015 10 Shirt 16 Originals Home 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 16 Originals Adidas Home 10 Chelsea Shirt hazard Red 2015 chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into hazard 10 Originals Home Adidas Shirt Chelsea Red 2015 16 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. ThisLee Blue Blue Short Lee Mom Mom Clear Mom Lee Clear Short Short IqCwgvg 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 Chelsea Originals 2015 hazard Red 16 Home 10 Adidas atoms in the mediumWomen T2163 Jacket Geox Brown Down W4425q naUxgW are maintained by some external energy Chelsea Shirt hazard 10 Adidas 16 Red Originals 2015 Home source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of 10 2015 Originals hazard Chelsea Adidas 16 Shirt Home Red 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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