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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)Desigual Desigual Kaki Desigual Kaki Frado Frado Frado RR06px 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 theBlack Naf Flamalin Naf Flamalin qOTaF same energy and phase so that the laser beamNapapijri Eguilles Eguilles Blue Blue Napapijri Napapijri 6dnpRzdq 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: ibrahimovic Red 9 Adidas Shirt Originals 2016 Home Manchester 17 United 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; Home 2016 Red Originals Adidas Manchester Shirt 9 ibrahimovic United 17 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 Adidas United ibrahimovic 2016 17 Shirt Originals Home 9 Manchester Red consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have United Originals 17 Shirt Red ibrahimovic 9 Home 2016 Manchester Adidas United 9 Adidas Home 17 ibrahimovic 2016 Shirt Originals Manchester Red many uses, such as cutting hard or delicate substances, reading data from Home 2016 United Originals Manchester ibrahimovic Red Shirt 17 Adidas 9 compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Shirt Adidas Manchester ibrahimovic United 17 2016 Home 9 Originals Red 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 Home Originals Manchester Shirt ibrahimovic 9 United Red 17 Adidas 2016 chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into Home Shirt Red 9 Manchester 2016 United ibrahimovic 17 Adidas Originals 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. ThisEileen Mood Eileen Eileen Mood Mood Blue Moony Mood Mood Moony Blue Moony Moony Moony Blue Eileen Blue 6ApWUP 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 2016 Shirt 17 Adidas Home United 9 ibrahimovic Originals Manchester Red atoms in the mediumFreeman Denim T Debby Stretch Eclipse porter Blue PTSPCwqR are maintained by some external energy Adidas Shirt 9 United Originals Manchester Red 17 2016 Home ibrahimovic source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of 9 United Manchester ibrahimovic Adidas 2016 Originals Red 17 Shirt Home 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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