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Collimated beam
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===Lasers=== [[Laser]] light from gas or crystal lasers is highly collimated because it is formed in an [[optical cavity]] between two parallel [[mirror]]s which constrain the light to a path perpendicular to the surfaces of the mirrors.<ref>{{cite web |url=http://www.worldoflasers.com/laserproperties.htm |title=Properties of Lasers |author=<!--Staff writer(s); no by-line.--> |date=2015 |website=World of Lasers |access-date=5 August 2015 }}</ref> In practice, gas lasers can use concave mirrors, flat mirrors, or a combination of both.<ref>{{cite book|title=Engineering Physics|last=Joshi|date=2010|publisher=[[Tata McGraw-Hill Education]]|isbn=9780070704770|page=517}}<!--|access-date=6 August 2015 --></ref><ref>{{cite book|title=Engineering Physics 1: For WBUT|author=<!--Staff writer(s); no by-line.-->|date=n.d.|publisher=Pearson Education India|isbn=9788131755938|location=India|pages=3β9}}<!--|access-date=6 August 2015 --></ref><ref>{{cite book|title=Elementary Modern Physics|last=Tipler|first=Paul|date=1992|publisher=MacMillan|isbn=9780879015695|page=149}}<!--|access-date=6 August 2015 --></ref> The [[Divergence (optics)|divergence]] of high-quality laser beams is commonly less than 1 [[milliradian]] (3.4 [[arcmin]]), and can be much less for large-diameter beams. [[Laser diode]]s emit less-collimated light due to their short cavity, and therefore higher collimation requires a collimating lens.
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