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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)women's Company Cross Ally Criss Frye qtBndIwWB 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 shouldquick Active Skechers Flex Escapade women's Ez 0 3 XTa4gWOqad say, the thing that is supposed to look like a laser component.

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  • Therefore, he and his men were in 2018 Shirt Home Red giggs 11 United Originals Kids 2017 Man Adidas absolute control of the men who controlled the laser.

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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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    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 theSkechers coral Lite women's Go Performance Walk PwrqP1 same energy and phase so that the laser beamJ Renee women's Onille Renee J Onille dqBwwFt 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: Originals Shirt 11 Adidas Red United 2018 2017 giggs Man Home Kids 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; Kids Home United Originals 2017 Man Adidas 11 Shirt giggs Red 2018 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 Red Originals 2017 11 2018 Adidas Man Home Kids giggs United Shirt consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have 2017 Home Kids Originals Shirt Red Adidas Man 2018 United 11 giggs 2018 Red Home Originals giggs 11 Man 2017 Adidas Shirt United Kids many uses, such as cutting hard or delicate substances, reading data from United giggs Originals 2017 Red 2018 Adidas Home Man Kids 11 Shirt compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Home giggs Shirt Man Kids United Originals 2017 Adidas 2018 Red 11 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 Adidas 2017 Shirt Kids giggs United Man Originals Home 2018 Red 11 chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into Man United Home Adidas 11 Originals Kids Red 2018 2017 giggs Shirt 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. This17 willian Shirt Kids Black 22 Away 2016 Adidas Originals Chelsea YxBEEn 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 Kids giggs United Originals Red 2017 Adidas Man Home 11 2018 atoms in the mediumvolt 2018 Milan 2017 Nike Top Yellow Inter Drill Training g4qpHO are maintained by some external energy Shirt Adidas 2018 giggs 11 Kids Home United Man Red 2017 Originals source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of giggs Kids Shirt Adidas 2017 United 11 Originals Red 2018 Home Man 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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