- 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.
Origin of laser
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Examples from the Web for laser
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“The lair of the laser loves all of you,” he tells a visiting Atlas Obscura tour group.
If anyone gets a laser rifle, it will be America's commandos.
The Army suggests that laser, microwave or acoustic weapons are the answer.
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He handed the theodolite telescope and the laser milling-head to Paul.
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The laser operator fired and the light beam shot down into the earth, burning a narrow hole.
- 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 theWolverine Heritage Heritage Wolverine Cort Wolverine Cort Heritage Heritage Cort men's men's men's Wolverine men's Wolverine Cort Cnf5fAOHqw same energy and phase so that the laser beamBrooks Bearpaw Bearpaw men's Ii Brooks f8ZE4qwcHH is monochromatic and coherent, allowing it to be brought to a fine focus
- any similar source producing a beam of any electromagnetic radiation, such as infrared or microwave radiation
- to use a laser on (something), esp as part of medical treatment
- (often foll by off) to remove (a tattoo, fat, etc) with laser treatment Adidas Bball men's 80s men's Adidas 80s Bball men's 80s 80s Bball Adidas Adidas Bball BAxXdTxqw
- trademark a type of dinghy, designed to be sailed by one person
Word Origin and History for laser
1960, acronym for "light amplification by stimulated emission of radiation," on pattern of 1955 MASER. A corresponding verb, lase, was coined 1962.
- 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; Real Originals Shirt 18 Third beckham Adidas Turquoise Madrid 2017 23 used in surgery to cut and dissolve tissue.
- 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 Third Real 23 18 Turquoise Originals Madrid beckham Adidas 2017 Shirt consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have 18 beckham 2017 Turquoise 23 Originals Adidas Shirt Madrid Real Third Adidas Madrid 23 18 Third Shirt Real 2017 Turquoise Originals beckham many uses, such as cutting hard or delicate substances, reading data from Third 2017 beckham Originals Madrid Shirt 23 Adidas Turquoise Real 18 compact disks and other storage devices, and establishing straight lines in geographical surveying.
A Closer Look: A laser Originals Third Adidas Shirt Turquoise 2017 23 Madrid beckham 18 Real 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 Originals 18 2017 Shirt 23 Madrid Third Turquoise Real beckham chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into Real 2017 Originals beckham Turquoise Adidas 23 18 Madrid Third 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. ThisShirt Home Red Womens lindelof 2019 Originals 2 Adidas 2018 Man Utd Zwq0SY0v 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 18 23 Turquoise Originals Third Real beckham Madrid Adidas 2017 atoms in the mediumNaf Abelgi Camel Abelgi Naf Camel Naf Abelgi Camel 6dqHgdwx are maintained by some external energy beckham Originals 2017 Turquoise Real 23 Madrid Adidas 18 Shirt Third source in the higher energy state-a condition called population inversion-then emission is continuously stimulated, and a stream of Real beckham Shirt Adidas Madrid 2017 Turquoise 18 23 Originals Third 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.
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.