la·ser (l  z r)n. Any of several devices that emit highly amplified and coherent radiation of one or more discrete frequencies. One of the most common lasers makes use of atoms in a metastable energy state that, as they decay to a lower energy level, stimulate others to decay, resulting in a cascade of emitted radiation. [l(ight) a(mplification by) s(timulated) e(mission of) r(adiation).] |   diagram showing the output stage of a ruby laser |
laser [ˈleɪzə]
n
1. (Physics / General Physics) 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 the same energy and phase so that the laser beam is monochromatic and coherent, allowing it to be brought to a fine focus
2. (Physics / General Physics) any similar source producing a beam of any electromagnetic radiation, such as infrared or microwave radiation See also maser
[from light amplification by stimulated emission of radiation]
| laser (lzr) 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 consists of a coherent beam of photons, all in phase and having the same polarization. Lasers have many uses, such as cutting hard or delicate substances, reading data from compact disks and other storage devices, and establishing straight lines in geographical surveying. A Closer Look A laser 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 chamber in which atoms of a medium such as a synthetic ruby rod or a gas are excited, bringing their electrons into 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. This 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 atoms in the medium are maintained by some external energy source in the higher energy state  a condition called population inversionthen emission is continuously stimulated, and a stream of 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 output stage of a ruby laser |
Any device that can produce or amplify optical radiation primarily by the process of controlled stimulated emission. A laser may emit electromagnetic radiation from the ultraviolet portion of the spectrum through the infrared portion. Also, an acronym for "light amplification by stimulated emission of radiation."
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  laser - an acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent lightoptical device - a device for producing or controlling light photocoagulator - surgical instrument containing a laser for use in photocoagulation |
Translations
laser
laser in cpds → Laser-;
laser in cpds → Laser-;
laser beam
n → Laserstrahl m
laser disc
n → Laserdisc f, → Laserdisk f
laser gun
n → Laserkanone f → or -pistole f
laser medicine
n → Lasermedizin f
laser printer
n → Laserdrucker m
laser show
n → Lasershow f
laser surgery
n → Laserchirurgie f
laser technology
n → Lasertechnik f
laser weapon
n → Laserwaffe f
n laser [ˈleizə]
(an instrument that produces) a narrow and very intense beam of light The men were cutting the sheets of metal with a laser; (also adjective ) a laser beam. laser أشِعَّة ليزر лазер laser; laserový laser; laser- der Laser, Laser-... λέιζερ láser laser لیزر laser laser לֵייזֶר लेजर laser lézer laser leysir, leysigeisli laser レーザー 레이저 lazeris lāzers; lāzera- laser laser laser(-) laser(owy) laser laser лазер laser; laserový laser laser laser แสงเลเซอร์ lazer 雷射 лазер, оптичний квантовий генератор سرخ، مرئی یا بالا بنفشی حصے میں مربوط یک رنگ شعاعوں کی شدید لہر la-de 激光
n laser printer
laserdrukker طابِعَة ليزر лазерен принтер laserová tiskárna laserprinter der Laserdrucker εκτυπωτής λέιζερ impresora a láser laserprinter چاپگر لیزری imprimante à laser מִדפֶּסֶת לֵייזֶר लेजर प्रिंटर laserski printer lézernyomtató printer laser stampante laser レーザープリンター lazerinis spausdintuvas lāzerprinteris pencetak laser laserprinter laserskriver drukarka laserowa лазерный принтер laserová tlačiareň laserski tiskalnik laserski štampač laserskrivare เครื่องพิมพ์เลเซอร์ lazer yazıcı 激光打印機 лазерний принтер لیزر کی شعاعوں پر مبنی طباعت کی مشین máy in la de 激光打印机
laser → ليزر laser laser Laser λέιζερ láser laser laser laser laser レーザー 레이저 laser laser laser laser лазер laser แสงเลเซอร์ lazer la-de 激光
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