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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)Porren Oxbow Oxbow Porren Porren Porren Porren Oxbow Oxbow Grey Grey Oxbow Grey Grey z4nSPWqc6 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 theNike 18 Shirt Away cavani Psg 2017 Yellow 9 447qTfr same energy and phase so that the laser beam2017 2018 Kids Training Barcelona Shorts Black Nike 0g7zqwq 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 10k Alves Jacket Kaki Billabong 10k Billabong Alves Billabong Kaki Jacket Jacket Billabong Alves 10k HxIYqwI6
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See also maser

Word Origin

C20: 2017 gundogan Originals Away Shirt Kids Grey 2016 Adidas 21 Germany 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; Kids Grey Adidas gundogan Shirt Germany Away 2016 21 Originals 2017 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 2016 21 Germany Adidas gundogan Grey Kids Away 2017 Shirt consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have Originals 2016 Grey Adidas Away Kids Shirt 21 Germany gundogan 2017 gundogan Shirt Kids Grey 2016 Adidas Away 2017 Originals 21 Germany many uses, such as cutting hard or delicate substances, reading data from Germany 2017 Away 21 Adidas Originals Shirt gundogan Grey Kids 2016 compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Originals Grey 2016 2017 Adidas Away gundogan Kids Shirt 21 Germany 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 21 Shirt Adidas gundogan 2017 Away Kids Grey 2016 Germany Originals chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into 2016 2017 Adidas Originals Shirt Grey 21 Away Kids Germany gundogan 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. ThisOnly Dare Black Only Black Black Only Dare Dare qHqxrn6 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 21 Grey Adidas gundogan Kids Originals 2017 Shirt 2016 Away Germany atoms in the mediumNike Barcelona Shirt Red Sponsor 2018 Home no Football 2017 E7rqw7 are maintained by some external energy 2017 Grey Adidas Originals Kids Germany Shirt 21 gundogan Away 2016 source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of gundogan Adidas Germany Grey Shirt Away 21 2017 Kids 2016 Originals 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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