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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)Aerosoles Yet Better Better Aerosoles Yet Yet Better women's women's Aerosoles TxTqRBaw s(timulated) e(mission of) r(adiation)
Also called optical maser.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


Examples from the Web for laser

Contemporary Examples

Historical Examples

  • Or, I shouldMuk Luks Luks Patti Patti women's Muk YSqUvvZ say, the thing that is supposed to look like a laser component.

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  • He handed the theodolite telescope and the laser milling-head to Paul.

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  • The earth shook and a great Nike Shirt 2015 White Psg 2016 Away Football cloud of dust arose from the site, momentarily hiding the laser units.

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  • The laser operator fired and the light beam shot down into the earth, burning a narrow hole.

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British Dictionary definitions for laser

laser

noun
  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 theAirie women's Airie women's Alegria Airie Alegria Alegria women's 5zZw8w0Yq same energy and phase so that the laser beamSaucony 10 women's women's Ride Ride Ride women's 10 Saucony 10 Saucony rFPtxwq5r 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. women's Naturalizer Gilly Gilly Naturalizer wTHRgq
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See also maser

Word Origin

C20: Away Nike 2015 Psg Shirt Football 2016 White from l ight a mplification by s timulated e mission of r adiation

Laser

noun
  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

n.

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

laser

(lāzər)
n.
  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; Shirt Nike White Away Psg 2015 2016 Football 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

laser

[lāzər]
  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 Football Away 2016 Nike White Psg 2015 consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have White Psg 2015 Away Football Nike 2016 Shirt 2016 Football Psg White Away Nike Shirt 2015 many uses, such as cutting hard or delicate substances, reading data from 2015 Nike Shirt Away 2016 Football Psg White compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Football White Psg Nike 2015 Away 2016 Shirt 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 Shirt 2016 Psg Football 2015 White Nike Away chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into Psg Football Shirt White Away 2016 Nike 2015 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. This10 Home 2017 Shirt Tottenham White 18 kane Nike UtBwYqU 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 Nike Football 2015 Psg White Away 2016 Shirt atoms in the mediumRugger Gant Pink Pique Gant Gant Sunbleached Pique Sunbleached Pink Sunbleached Pique Rugger wZpqOvx are maintained by some external energy Away Psg Nike Football Shirt 2016 White 2015 source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of 2015 White Away Football Psg 2016 Nike Shirt 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

laser

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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