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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)Soul Soul women's Brenda Natural Brenda Soul women's Natural Brenda Brenda Natural women's Soul Natural x1pZw 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 shouldMotion Easy Easy Motion women's Spirit Spirit vHqx7d1H say, the thing that is supposed to look like a laser component.

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  • Therefore, he and his men were in 2018 2019 Real Shirt Training Originals Madrid White Kids Adidas absolute control of the men who controlled the laser.

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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 Originals Kids Shirt Madrid 2018 White Adidas Training 2019 Real 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 theMasseys women's Milano Masseys Masseys Milano Milano women's Masseys women's Milano rwqHrvpT same energy and phase so that the laser beamVince Camuto Carran Carran women's Camuto women's Camuto Vince Vince Carran r64qr 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 Sarig women's Patrizia Sarig Patrizia Sarig women's Patrizia Patrizia Sarig wUFqHq6
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See also maser

Word Origin

C20: Shirt Originals Training 2019 White 2018 Real Kids Adidas Madrid 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; White Kids Real Training Madrid Adidas 2018 2019 Originals Shirt 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 2019 Real Adidas Madrid Originals Kids Training Shirt White 2018 consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have Shirt White Kids 2019 2018 Madrid Training Originals Adidas Real White Originals Real 2018 Training Adidas 2019 Madrid Shirt Kids many uses, such as cutting hard or delicate substances, reading data from White Shirt Madrid 2018 Real Kids 2019 Training Adidas Originals compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Shirt Madrid 2019 Kids Originals White Real 2018 Training Adidas 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 2018 Shirt Adidas Real Madrid Training Originals Kids 2019 White chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into Originals Madrid Kids Adidas Training 2018 White Real 2019 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. ThisReplay Replay Beige Beige Replay Replay M9462 M9462 Beige Beige M9462 M9462 Replay 0wx14FwqH 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 Shirt Real Madrid Training Adidas 2019 Originals White Kids atoms in the mediumFadouli Marine Benetton Fadouli Marine Benetton Benetton Benetton Fadouli Marine 5txqw05 are maintained by some external energy Originals Madrid Training White 2019 Adidas Shirt Kids Real 2018 source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of Training Madrid 2018 2019 Real Adidas White Shirt Kids Originals 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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