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Line 1: − [[Laser]] is a word formed from the acronym "Light Amplification by Stimulated Emission of Radiation."+ − [[http://lisa.jpl.nasa.gov/]] They're also used in bar code scanners.+ − +
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'''Laser''' is a word formed from the acronym "Light Amplification by Stimulated Emission of Radiation."
Light from a laser is both temporally [[coherent]], meaning it is of a single pure color, and spatially coherent, meaning that it can be easily formed into a thin beam or focused to a small spot. The angle at which a laser beam spreads is determined by [[diffraction]]; a wide beam will diverge more slowly than a narrow beam. Many cheap laser pointers exhibit excess beam dissipation due to cheap manufacturing, and shoddy construction.
Light from a laser is both temporally [[coherent]], meaning it is of a single pure color, and spatially coherent, meaning that it can be easily formed into a thin beam or focused to a small spot. The angle at which a laser beam spreads is determined by [[diffraction]]; a wide beam will diverge more slowly than a narrow beam. Many cheap laser pointers exhibit excess beam dissipation due to cheap manufacturing, and shoddy construction.
The use of lasers is very important in [[science]] and [[medicine]]; they have also become ubiquitous in [[CD-ROM]] and [[DVD]] players and as pointers.
The use of lasers is very important in [[science]] and [[medicine]]; they have also become ubiquitous in [[CD-ROM]] and [[DVD]] players and as pointers.
[http://lisa.jpl.nasa.gov/] They're also used in bar code scanners.
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[[category:technology]]
[[Category:Technology]]