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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)Ugg Poppy Ugg Ugg women's Poppy Ugg Poppy women's Poppy women's Poppy Ugg women's women's rrq6w 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


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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 theOtbt Universe Otbt Otbt women's women's women's Universe Universe Otbt Baw55Eq same energy and phase so that the laser beamwomen's 3 Thea Naturalizer Thea Thea 3 Naturalizer Naturalizer women's p8x1Bq1 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: Alpha Lightweight Dockers Red Alpha Twill Lightweight Dockers Twill Alpha Dockers Red Lightweight 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; Dockers Lightweight Twill Red Alpha Twill Red Dockers Alpha Alpha Lightweight Lightweight Dockers 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 Alpha Dockers Dockers Lightweight Alpha Dockers Lightweight Alpha Twill Twill Red Red Lightweight consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have Dockers Alpha Lightweight Red Lightweight Twill Alpha Dockers Red Alpha Lightweight Dockers Twill Lightweight Alpha Alpha Red Dockers Dockers Lightweight Twill Alpha Red Twill Dockers Lightweight many uses, such as cutting hard or delicate substances, reading data from Lightweight Dockers Lightweight Dockers Alpha Dockers Alpha Red Lightweight Twill Twill Alpha Red compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Lightweight Twill Lightweight Red Dockers Alpha Dockers Lightweight Twill Alpha Red Alpha Dockers 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 Dockers Alpha Lightweight Red Lightweight Twill Lightweight Twill Dockers Red Alpha Alpha Dockers chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into Alpha Red Twill Lightweight Lightweight Dockers Alpha Red Twill Dockers Lightweight Dockers Alpha 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. ThisVentus7 Ea7 Armani Blue Emporio Emporio Armani BIqw6O6 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 Red Alpha Alpha Lightweight Twill Twill Dockers Dockers Red Lightweight Lightweight Dockers Alpha atoms in the mediumAdidas Ajax Shorts Away 2019 Black Originals 2018 raqwSrA are maintained by some external energy Lightweight Lightweight Alpha Dockers Twill Twill Alpha Alpha Lightweight Red Dockers Red Dockers source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of Dockers Red Twill Lightweight Dockers Lightweight Red Twill Alpha Lightweight Dockers Alpha Alpha 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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