Laser
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation . The term "laser" originated as an acronym for " light amplification by stimulated emission of radiation ". [1] [2] The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories , based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow .
Page Revisions
| Year | Metadata | Sections | Top Words | First Paragraph |
| 2018 |
283092 characters 40 sections 97 paragraphs 34 images 546 internal links 137 external links |
4. Continuous and pulsed modes of operation |
lasers 0.696 laser 0.456 beam 0.146 lasing 0.106 nm 0.105 optical 0.100 pulses 0.095 stimulated 0.092 light 0.089 gain 0.087 pulsed 0.085 medium 0.084 power 0.081 emission 0.081 coherence 0.073 |
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation . The term "laser" originated as an acronym for " light amplification by stimulated emission of radiation ". [1] [2] The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories , based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow . |
| 2017 |
274625 characters 40 sections 94 paragraphs 33 images 547 internal links 125 external links |
4. Continuous and pulsed modes of operation |
lasers 0.685 laser 0.466 beam 0.133 nm 0.108 lasing 0.104 optical 0.101 pulses 0.095 light 0.092 stimulated 0.091 pulsed 0.088 gain 0.088 medium 0.087 power 0.082 emission 0.081 coherence 0.075 |
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation . The term "laser" originated as an acronym for " light amplification by stimulated emission of radiation ". [1] [2] The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories , based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow . |
| 2016 |
257468 characters 40 sections 90 paragraphs 31 images 520 internal links 108 external links |
4. Continuous and pulsed modes of operation |
lasers 0.675 laser 0.462 beam 0.143 nm 0.113 lasing 0.108 optical 0.103 light 0.098 stimulated 0.095 pulsed 0.092 gain 0.092 pulses 0.091 medium 0.091 power 0.088 emission 0.085 coherence 0.079 |
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation . The term "laser" originated as an acronym for " light amplification by stimulated emission of radiation ". [1] [2] The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories , based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow . A laser differs from other sources of light in that it emits light coherently . Spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting and lithography . Spatial coherence also allows a laser beam to stay narrow over great distances ( collimation ), enabling applications such as laser pointers . Lasers can also have high temporal coherence , which allows them to emit light with a very narrow spectrum , i.e., they can emit a single color of light. Temporal coherence can be used to produce pulses of light as short as a femtosecond . |
| 2015 |
221480 characters 39 sections 86 paragraphs 30 images 508 internal links 76 external links |
4. Continuous and pulsed modes of operation |
lasers 0.684 laser 0.451 beam 0.141 nm 0.115 lasing 0.110 optical 0.100 light 0.098 pulsed 0.093 gain 0.093 stimulated 0.092 medium 0.092 power 0.089 pulses 0.088 emission 0.086 coherence 0.080 |
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation . The term "laser" originated as an acronym for " light amplification by stimulated emission of radiation ". [1] [2] The first laser was built in 1960 by Theodore H. Maiman at Hughes Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow . A laser differs from other sources of light in that it emits light coherently . Spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting and lithography . Spatial coherence also allows a laser beam to stay narrow over great distances ( collimation ), enabling applications such as laser pointers . Lasers can also have high temporal coherence , which allows them to emit light with a very narrow spectrum , i.e., they can emit a single color of light. Temporal coherence can be used to produce pulses of light as short as a femtosecond . |
| 2014 |
213112 characters 40 sections 91 paragraphs 28 images 508 internal links 65 external links |
4. Continuous and pulsed modes of operation |
lasers 0.690 laser 0.446 beam 0.143 nm 0.114 lasing 0.109 optical 0.099 light 0.097 stimulated 0.096 medium 0.094 pulsed 0.092 gain 0.092 power 0.088 emission 0.088 pulses 0.087 coherence 0.079 |
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation . The term "laser" originated as an acronym for " light amplification by stimulated emission of radiation ". [1] [2] A laser differs from other sources of light because it emits light coherently . Spatial coherence allows a laser to be focused to a tight spot, enabling applications like laser cutting and lithography . Spatial coherence also allows a laser beam to stay narrow over long distances ( collimation ), enabling applications such as laser pointers . Lasers can also have high temporal coherence which allows them to have a very narrow spectrum , i.e., they only emit a single color of light. Temporal coherence can be used to produce pulses of light—as short as a femtosecond . |
| 2013 |
191448 characters 40 sections 93 paragraphs 25 images 409 internal links 58 external links |
4. Continuous and pulsed modes of operation |
lasers 0.692 laser 0.446 beam 0.143 nm 0.113 lasing 0.108 light 0.096 optical 0.096 stimulated 0.095 pulsed 0.092 medium 0.091 gain 0.089 power 0.088 emission 0.088 pulses 0.087 coherence 0.079 |
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation . The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation". [1] [2] Lasers differ from other sources of light because they emit light coherently . Spatial coherence allows a laser to be focused to a tight spot, enabling applications like laser cutting and lithography . Spatial coherence also allows a laser beam to stay narrow over long distances ( collimation ), enabling applications such as laser pointers . Lasers can also have high temporal coherence which allows them to have a very narrow spectrum , i.e., they only emit a single color of light. Temporal coherence can be used to produce pulses of light—as short as a femtosecond . |
| 2012 |
174571 characters 39 sections 92 paragraphs 20 images 391 internal links 57 external links |
4. Continuous and pulsed modes of operation |
lasers 0.682 laser 0.443 beam 0.148 nm 0.118 lasing 0.113 optical 0.100 stimulated 0.099 pulsed 0.096 light 0.094 gain 0.093 medium 0.092 emission 0.091 power 0.090 pulses 0.086 fiber 0.081 |
A laser is a device that emits light ( electromagnetic radiation ) through a process of optical amplification based on the stimulated emission of photons . The term "laser" originated as an acronym for Light Amplification by Stimulated Emission of Radiation . [1] [2] The emitted laser light is notable for its high degree of spatial and temporal coherence . |
| 2011 |
164274 characters 35 sections 84 paragraphs 17 images 383 internal links 58 external links |
4. Continuous and pulsed modes of operation |
lasers 0.695 laser 0.439 beam 0.157 nm 0.121 lasing 0.109 optical 0.100 pulsed 0.098 stimulated 0.097 power 0.092 light 0.092 gain 0.090 pulses 0.089 medium 0.086 fiber 0.084 emission 0.080 |
A laser is a device that emits light ( electromagnetic radiation ) through a process of optical amplification based on the stimulated emission of photons . The term "laser" originated as an acronym for Light Amplification by Stimulated Emission of Radiation . [1] [2] The emitted laser light is notable for its high degree of spatial and temporal coherence , unattainable using other technologies. |
| 2010 |
155074 characters 34 sections 84 paragraphs 19 images 387 internal links 46 external links |
4. Continuous and pulsed modes of operation |
lasers 0.699 laser 0.431 beam 0.158 nm 0.122 lasing 0.110 optical 0.101 pulsed 0.099 stimulated 0.098 power 0.095 pulses 0.089 gain 0.088 light 0.087 fiber 0.084 medium 0.084 emission 0.080 |
A laser is a device that emits light ( electromagnetic radiation ) through a process of optical amplification based on the stimulated emission of photons . The term "laser" originated as an acronym for Light Amplification by Stimulated Emission of Radiation . [1] [2] The emitted laser light is notable for its high degree of spatial and temporal coherence , unattainable using other technologies. |
| 2009 |
134099 characters 36 sections 83 paragraphs 14 images 355 internal links 33 external links |
lasers 0.658 laser 0.497 beam 0.155 nm 0.137 fiber 0.110 pulsed 0.110 light 0.106 cavity 0.102 semiconductor 0.094 stimulated 0.093 maser 0.083 medium 0.079 townes 0.075 pump 0.074 power 0.072 |
Light Amplification by Stimulated Emission of Radiation , LASER ( laser ), is a mechanism for emitting light within the electromagnetic radiation region of the spectrum, via the process of stimulated emission . The emitted laser light is (usually) a spatially coherent , narrow low-divergence beam , that can be manipulated with lenses . In laser technology, “coherent light” denotes a light source that produces (emits) light of in-step waves of identical frequency and phase. [1] The laser’s beam of coherent light differentiates it from light sources that emit incoherent light beams, of random phase varying with time and position; whereas the laser light is a narrow- wavelength electromagnetic spectrum monochromatic light; yet, there are lasers that emit a broad spectrum light, or simultaneously, at different wavelengths. |
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| 2008 |
131978 characters 35 sections 90 paragraphs 14 images 346 internal links 32 external links |
lasers 0.721 laser 0.431 beam 0.141 nm 0.134 fiber 0.107 pulsed 0.107 light 0.100 cavity 0.099 semiconductor 0.098 stimulated 0.090 medium 0.077 maser 0.074 townes 0.073 emission 0.072 pump 0.072 |
A laser is a device that emits light ( electromagnetic radiation ) through a process called stimulated emission . The term "laser" is an acronym for Light Amplification by Stimulated Emission of Radiation . [1] [2] Laser light is usually spatially coherent , which means that the light either is emitted in a narrow, low-divergence beam , or can be converted into one with the help of optical components such as lenses . Typically, lasers are thought of as emitting light with a narrow wavelength spectrum ("monochromatic" light). This is not true of all lasers, however: some emit light with a broad spectrum, while others emit light at multiple distinct wavelengths simultaneously. The coherence of typical laser emission is distinctive. Most other light sources emit incoherent light, which has a phase that varies randomly with time and position. |
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| 2007 |
118731 characters 35 sections 81 paragraphs 14 images 322 internal links 26 external links |
3. Types and operating principles |
lasers 0.620 laser 0.515 beam 0.183 nm 0.148 cavity 0.110 light 0.100 medium 0.092 stimulated 0.088 fiber 0.087 pulsed 0.085 gain 0.083 maser 0.082 townes 0.081 optical 0.080 pump 0.079 |
A laser is an electronic-optical device that produces coherent radiation . The term "laser" is an acronym for L ight A mplification by S timulated E mission of R adiation. [1] [2] A typical laser emits light in a narrow, low- divergence beam and with a well-defined wavelength (i.e., monochromatic , corresponding to a particular colour if the laser is operating in the visible spectrum ). This is in contrast to a light source such as the incandescent light bulb , which emits into a large solid angle and over a wide spectrum of wavelength. |
| 2006 |
81573 characters 28 sections 70 paragraphs 10 images 247 internal links 18 external links |
laser 0.557 lasers 0.547 beam 0.215 fiber 0.161 nm 0.157 maser 0.116 stimulated 0.106 townes 0.093 light 0.092 emission 0.085 output 0.085 medium 0.084 diode 0.079 optical 0.077 yag 0.075 |
A LASER (from the acronym of L ight A mplification by S timulated E mission of R adiation) is an optical source that emits photons in a coherent beam. The term has since entered the English language as a standard word, laser, losing the capitalization in the process. The back-formed verb to lase means "to produce laser light" or possibly "to apply laser light to". [1] |
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| 2005 |
55792 characters 13 sections 37 paragraphs 7 images 222 internal links 13 external links |
laser 0.584 lasers 0.471 beam 0.280 maser 0.168 townes 0.130 light 0.107 stimulated 0.097 optical 0.096 collimated 0.093 medium 0.091 amplification 0.084 cavity 0.083 output 0.081 emission 0.079 bell 0.077 |
A LASER ( L ight A mplification by S timulated E mission of R adiation) is an optical source that emits photons in a coherent beam. Laser light is typically near- monochromatic , i.e. consisting of a single wavelength or hue , and emitted in a narrow beam. This is in contrast to common light sources , such as the incandescent light bulb , which emit incoherent photons in almost all directions, usually over a wide spectrum of wavelengths. Laser action is understood by application of quantum mechanics and thermodynamics theory (see laser science ). |
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| 2004 |
28677 characters 7 sections 14 paragraphs 3 images 119 internal links 8 external links |
laser 0.568 lasers 0.350 beam 0.224 light 0.199 maser 0.175 townes 0.162 collimated 0.129 medium 0.110 beams 0.109 gordon 0.094 divergence 0.091 resonator 0.087 amplification 0.087 lasing 0.087 inversion 0.087 |
A laser ( light amplification by stimulated emission of radiation ) is a device which uses a quantum mechanical effect , stimulated emission , to generate a coherent beam of light from a lasing medium of controlled purity, size, and shape. The output of a laser may be a continuous, constant-amplitude output (known as CW or continuous wave ), or pulsed, by using the techniques of Q-switching , modelocking , or gain-switching . In pulsed operation, much higher peak powers can be achieved. A laser medium can also function as an optical amplifier when seeded with light from another source. The amplified signal can be very similar to the input signal in terms of wavelength, phase, and polarisation; this is particularly important in optical communications . The verb "to lase" means to give off coherent light or possibly to cut or otherwise treat with coherent light, and is a back-formation of the term laser. |
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| 2003 |
12122 characters 1 sections 15 paragraphs 1 images 67 internal links 1 external links |
laser 0.519 lasers 0.393 townes 0.242 beam 0.224 light 0.221 maser 0.218 coherent 0.128 stimulated 0.126 output 0.117 quantum 0.116 inversion 0.098 basov 0.097 collimated 0.097 maiman 0.097 prokhorov 0.097 |
Laser is an acronym for " L ight A mplification by S timulated E mission of R adiation". It uses a quantum mechanical effect , stimulated emission , to generate a very collimated , monochromatic and coherent beam of light. |
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| 2002 |
10594 characters 0 sections 12 paragraphs 0 images 50 internal links 0 external links |
laser 0.549 lasers 0.446 beam 0.314 light 0.255 wavelength 0.143 coherent 0.131 collimated 0.099 maiman 0.099 stimulated 0.096 output 0.096 maser 0.089 photons 0.086 polarisation 0.084 amplified 0.084 monochromatic 0.084 |
Laser was originally an acronym for " L ight A mplification by S timulated E mission of R adiation". It uses a quantum mechanical effect , stimulated emission , to generate a very collimated , monochromatic and coherent beam of light. |
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| 2001 |
10177 characters 0 sections 23 paragraphs 0 images 47 internal links 0 external links |
laser 0.509 lasers 0.480 beam 0.338 light 0.253 wavelength 0.153 collimated 0.106 maiman 0.106 maser 0.096 photons 0.092 polarisation 0.090 monochromatic 0.090 eye 0.087 shone 0.080 emitted 0.077 divergence 0.075 |
Originally an acronym for " L ight A mplification by S timulated E mission of R adiation", a laser uses a quantum mechanical effect , stimulated emission , to generate a very collimated , monochromatic and coherent beam of light. |