Old 01-21-2013, 05:24 AM #1
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Default can a green laser been seen 10km away?

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?


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Old 01-21-2013, 05:42 AM #2
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Default Re: can a green laser been seen 10km away?

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.


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Old 01-21-2013, 06:48 AM #3
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Default Re: can a green laser been seen 10km away?

Wooh it seems like the whole city can see a green beam. Nice
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Old 01-21-2013, 07:58 AM #4
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Default Re: can a green laser been seen 10km away?

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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Old 01-27-2013, 11:50 AM #5
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Default Re: can a green laser been seen 10km away?

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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