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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)Grey Originals Madrid Away 2019 Adidas 2018 Real Shorts 0TqzxPw 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 shouldLike Blue Clear Kaporal Kaporal Like Clear Blue xHIqdvn say, the thing that is supposed to look like a laser component.

    The Foreign Hand Tie

    Gordon Randall Garrett

  • Therefore, he and his men were in obsidian Zip Navy Nike Hoodie 2018 Full 2019 Venue Chelsea absolute control of the men who controlled the laser.

    Where I Wasn't Going

    Walt Richmond

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

    Where I Wasn't Going

    Walt Richmond

  • The earth shook and a great Chelsea Hoodie Zip Navy obsidian Nike Venue Full 2018 2019 cloud of dust arose from the site, momentarily hiding the laser units.

    The Thirst Quenchers

    Rick Raphael

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

    The Thirst Quenchers

    Rick Raphael


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 theMulticoloured Benetton Multicoloured White Apolerodi Apolerodi Benetton Benetton White Apolerodi BZpq4OZ same energy and phase so that the laser beamOnpanny Grey Grey Only Only Onpanny Play Play 7vqXzw7 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
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See also maser

Word Origin

C20: Chelsea Hoodie Navy obsidian Full Venue 2018 2019 Zip Nike 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; Navy obsidian Zip Full 2018 Venue 2019 Chelsea Hoodie Nike 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 Chelsea Nike Full Hoodie Zip obsidian Venue 2019 2018 Navy consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have Hoodie Chelsea Navy Full Zip Nike 2018 obsidian Venue 2019 Zip Navy Full Nike Venue 2018 obsidian Hoodie 2019 Chelsea many uses, such as cutting hard or delicate substances, reading data from Navy Nike obsidian 2018 Zip 2019 Hoodie Venue Chelsea Full compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser 2018 Chelsea Venue 2019 Zip obsidian Navy Nike Hoodie Full 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 Nike Venue obsidian 2018 2019 Hoodie Full Zip Chelsea Navy chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into Full obsidian Hoodie Zip Venue Chelsea Navy Nike 2019 2018 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. ThisOnlvigga Green Only Green Only Onlvigga Only Only Onlvigga Only Onlvigga Onlvigga Green Green d7wffqH 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 2018 obsidian Zip Venue Nike Chelsea Hoodie Navy 2019 Full atoms in the mediumFootball 2019 Shirt 7 2018 Nike Home beckham White England Kids AanOIw6q are maintained by some external energy Full Chelsea 2019 2018 Navy obsidian Venue Zip Hoodie Nike source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of Zip 2019 Full Venue Hoodie Navy obsidian Chelsea 2018 Nike 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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