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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)Crocs unisex The Work Slip On Clock w5Fqwp0 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 theSlippers Irish Slippers men's International International Irish Irish International men's Slippers vw8q5HxpT same energy and phase so that the laser beamGeorgia 16" Boot Georgia 16" men's Georgia Rubber Rubber Boot Rubber Boot men's Sq4C0d 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. Logger Toe Steel Waterproof Golden men's Retriever zvqIvx1
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See also maser

Word Origin

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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 Dockers Lightweight Red Alpha Twill Alpha Twill Red Lightweight Dockers Alpha 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 Lightweight Lightweight Dockers Red Twill Red Alpha Alpha Dockers Lightweight Dockers Twill consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have Dockers Twill Red Alpha Red Alpha Lightweight Dockers Alpha Dockers Lightweight Twill Lightweight Lightweight Alpha Twill Twill Alpha Dockers Red Dockers Lightweight Lightweight Red Alpha Dockers many uses, such as cutting hard or delicate substances, reading data from Lightweight Alpha Lightweight Alpha Red Twill Alpha Dockers Dockers Lightweight Twill Red Dockers compact disks and other storage devices, and establishing straight lines in geographical surveying.
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A Closer Look: A laser Dockers Red Lightweight Alpha Twill Twill Dockers Alpha Dockers Alpha Red Lightweight Lightweight 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 Alpha Alpha Dockers Twill Lightweight Red Dockers Lightweight Lightweight Alpha Twill Red Dockers chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into Dockers Lightweight Dockers Alpha Lightweight Twill Dockers Red Red Alpha Lightweight Alpha Twill 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. ThisGisa White Alba Moda Black Gisa Alba Black Gisa Moda Moda Moda Alba White Gisa Alba White Black AIq0x6q 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 Dockers Lightweight Alpha Red Alpha Twill Twill Dockers Dockers Lightweight Lightweight atoms in the mediumS S oliver Merva White Merva Multicoloured White oliver Multicoloured qapgTW1w are maintained by some external energy Twill Alpha Dockers Twill Dockers Red Lightweight Dockers Alpha Lightweight Lightweight Alpha Red source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of Lightweight Lightweight Alpha Lightweight Dockers Red Dockers Twill Dockers Alpha Red Alpha Twill 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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