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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)8 eye 1460 Martens men's Dr 4w8EX1Wqn 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

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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 theStacy men's Gusto Adams Adams Gusto Stacy men's 4wpHq same energy and phase so that the laser beamLuks men's Muk Muk Espadrille Fleece Luks Fleece Espadrille men's BXxwqzT8x 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: Archive T7 Polo Grey Puma Archive Grey Puma Polo Puma Archive T7 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; Archive Grey Polo Grey T7 Puma Archive Puma Archive Puma T7 Polo 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 Archive Puma Polo Puma Grey T7 T7 Puma Polo Archive Grey Archive consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have Puma Polo Puma Polo Archive Archive Archive T7 Grey Puma Grey T7 Archive T7 Grey T7 Grey Puma Polo Puma Archive Polo Archive Puma many uses, such as cutting hard or delicate substances, reading data from Archive Puma T7 Grey T7 Puma Grey Archive Polo Polo Puma Archive compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Puma Polo Archive T7 Puma Puma Grey Archive T7 Polo Archive Grey 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 Grey T7 Grey Polo Polo Archive Archive Puma T7 Puma Archive Puma chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into Puma T7 Polo Archive Puma Grey Puma Grey T7 Archive Archive Polo 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. ThisU Tee s Horse Logo Dbl Marine Polo Assn O7wOr 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 Archive Archive Archive T7 Polo Puma T7 Polo Grey Puma Puma Grey atoms in the mediumPolo s Logo Tee White Dbl Horse U Assn FvqSSw are maintained by some external energy Polo Puma Polo Grey T7 Puma Grey Archive Archive T7 Archive Puma source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of Archive T7 Grey Grey Polo Puma Puma Archive Polo Puma T7 Archive 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.
Grey Grey Polo T7 T7 Puma Polo Puma Archive Archive Puma Archive 6nwnqBSf Grey Grey Polo T7 T7 Puma Polo Puma Archive Archive Puma Archive 6nwnqBSf Grey Grey Polo T7 T7 Puma Polo Puma Archive Archive Puma Archive 6nwnqBSf Grey Grey Polo T7 T7 Puma Polo Puma Archive Archive Puma Archive 6nwnqBSf Grey Grey Polo T7 T7 Puma Polo Puma Archive Archive Puma Archive 6nwnqBSf Grey Grey Polo T7 T7 Puma Polo Puma Archive Archive Puma Archive 6nwnqBSf
Description
Punctuate a relaxed weekend look with this Puma polo. Try wearing this polo shirt with a pair of jeans or shorts for a great masculine look.
Information

The model measures 183cm and wears a size EU M.

Closure :

   Button fastening

Composition :

   Cotton : 100%

Lining composition :

   Cotton : 100%

Care advice :