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on Oct 23, 2013
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NASA Laser Communication System Sets Record with T...
The width of the beam is determined by diffraction, caused by the finite aperture of the laser:
http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/cirapp.htm...
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http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/cirapp.htm...