Lasers, LEDs and light sources


Ontology type: npg:Subject  | skos:Concept     


Concept Info

NAME

Lasers, LEDs and light sources

DESCRIPTION

Lasers, LEDs and light sources are devices that create light. LEDs (light emitting diodes) convert an electrical current into light using spontaneous emission in optically active semiconductors. Lasers add a mechanism for optical feedback, such as mirrors, that stimulates further emission and generates a high-intensity beam of radiation.

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This table displays all metadata directly associated to this object as RDF triples.

252 TRIPLES      10 PREDICATES      23 URIs      5 LITERALS

Subject Predicate Object
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2 sgo:sdDataset onto_subjects
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5 rdfs:label Lasers, LEDs and light sources
6 skos:altLabel Light-emitting diode
7 skos:broader sg:ontologies/subjects/materials-for-optics
8 sg:ontologies/subjects/optics-and-photonics
9 skos:definition Lasers, LEDs and light sources are devices that create light. LEDs (light emitting diodes) convert an electrical current into light using spontaneous emission in optically active semiconductors. Lasers add a mechanism for optical feedback, such as mirrors, that stimulates further emission and generates a high-intensity beam of radiation.
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15 sg:ontologies/subjects/inorganic-leds
16 sg:ontologies/subjects/mode-locked-lasers
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18 sg:ontologies/subjects/quantum-cascade-lasers
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21 sg:ontologies/subjects/ultrafast-lasers
22 skos:prefLabel Lasers, LEDs and light sources
23 sg:ontologies/subjects/ dcterms:description The Nature Subjects Taxonomy is a polyhierarchical categorization of scholarly subject areas which are used for the indexing of content by Springer Nature.
24 dcterms:title Nature Subjects Taxonomy
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36 sg:ontologies/subjects/diode-lasers sgo:sdDataset onto_subjects
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42 GaAlAs Lasers
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52 Semiconductor Diode Lasers
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55 skos:broader sg:ontologies/subjects/lasers-leds-and-light-sources
56 skos:definition Diode lasers are electrically driven lasers generally made from semiconducting materials. In addition to the optical considerations common with all semiconductors, diode laser structures must also incorporate a means of injecting an electrical current into the active region. This often involves extra semiconductor layers and metal contacts.
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64 skos:definition Fibre lasers are lasers made from thin strands of a light-guiding glass. Atomic or molecular impurities introduced into the fibre when it is formed provide the optically active component, and the optical feedback required for stimulated emission can be created by patterning part of the fibre so it acts as a mirror.
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72 skos:definition Free-electron lasers create coherent light by constantly accelerating a beam of electrons. Free-electron lasers are particularly useful because they can produce radiation with a short-wavelength, down to just a few tenths of a nanometre. Thus, it is hoped they will become an important tool for atom-level material characterization.
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80 skos:definition High-field lasers are lasers that can create intense electric fields. The high fields are often achieved by concentrating the optical energy into a very short temporal pulse. This has led to the development of terawatt and petawatt lasers, which are important probes of matter under extreme conditions.
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88 skos:definition Inorganic LEDs are light-emitting diodes (LEDs) made from a crystalline semiconductor. The optical emission wavelength can be selected by varying material composition. Example active regions include germanium, gallium arsenide, gallium nitride and indium phosphide. Inorganic LEDS are prized for their low power consumption and are rapidly replacing conventional incandescent light bulbs.
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113 skos:definition Mode-locked lasers generate short pulses of intense coherent light. Just like a guitar string, laser cavities can support many different frequencies, or resonant modes. A train of picosecond or femtosecond pulses can be produced by actively or passively controlling the light in the cavity so that these different resonant modes interfere.
114 skos:inScheme sg:ontologies/subjects/
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121 skos:broader sg:ontologies/subjects/physical-sciences
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131 sg:ontologies/subjects/organic-leds sgo:sdDataset onto_subjects
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140 skos:broader sg:ontologies/subjects/lasers-leds-and-light-sources
141 skos:definition Organic LEDs are light emitting diodes (LEDs) that use polymers or small organic molecules as their optically active element. Development of organic LEDs is driven in particular by its potential as a display technology. Organic LEDs can be fabricated on flexible substrates, unlike their rigid inorganic counterparts.
142 skos:inScheme sg:ontologies/subjects/
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144 sg:ontologies/subjects/quantum-cascade-lasers sgo:sdDataset onto_subjects
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148 skos:altLabel Diode Laser
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150 GaAlAs Laser
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154 Gallium Aluminum Arsenide Lasers
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160 Semiconductor Laser
161 Semiconductor Lasers
162 skos:broader sg:ontologies/subjects/lasers-leds-and-light-sources
163 skos:definition Quantum cascade lasers are made up of many thin layers of semiconductor. An injected electron makes a small energy transition as it moves from one layer to the next, emitting light on each cascade. Because the energy steps are small, quantum cascade lasers can produce long-wavelength mid-infrared or terahertz radiation.
164 skos:inScheme sg:ontologies/subjects/
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166 sg:ontologies/subjects/semiconductor-lasers sgo:sdDataset onto_subjects
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184 skos:broader sg:ontologies/subjects/lasers-leds-and-light-sources
185 skos:definition Semiconductor lasers use the optical properties of semiconducting materials to produce coherent light. Electrons and their positive-charge counterpart called holes are injected into an optically active region where they combine together and generate photons. Reflection of light from semiconductor–air or semiconductor–semiconductor interfaces proved the necessary optical feedback.
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235 Yttrium-Scandium-Gallium Garnet Lasers
236 skos:broader sg:ontologies/subjects/lasers-leds-and-light-sources
237 skos:definition Solid-state lasers are lasers made from crystalline materials. The very first laser used ruby as a solid-state active region in 1960, and there are now hundreds of known alternatives. The most common approach however is to introduce rare-earth atoms into a crystalline lattice – titanium-doped sapphire, for example.
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