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can a green laser been seen 10km away?

lipo99

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Jan 18, 2013
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If I have a 50mw green laser and I point towards my friend house which is 10km away do you think he will see it?
 





ARG

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Feb 27, 2011
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Depends on the divergence as well as the power.

This was 1km away from the source, but it was with a 300mW 532nm laser and it has 0.6mrad divergence.

LFBzs.jpg
 
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Blord

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Your friend can see the green light flashing if you point the laser at his house. At 10Km it is probably safe for a 50mW laser.
 
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My friend has a 30mW one. We went to an open field that was probably around 700m long at a guess and it was pretty clearly visible over that distance, so you should be fine.

Regardless, you shouldn't be pointing it anywhere near the sky due to plane/helicopter danger.
 




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