Quote:
Originally Posted by smenkhare
the reason why lasers are so useful is why the range makes little difference.
the light stays coherent.
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I'm no expert, but staying 'coherent' doesn't mean the light stays tight, focused and powerful, AFAIK.
http://onlinedictionary.datasegment....herent%20light
Lots of other reasons anyway.. beam divergence, aiming the beam at a 6mm target (eye pupil) over few hundred meters, IR filters in the laser, etc...