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ArcticMyst Security by Avery

150mw 532nm 5 volt green laser module

Joined
Apr 2, 2016
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Im working on a project with a 150mw green laser module with an adjustable focus ring .can i make the beam out of focus and also put a small lens in front of the beam to make it show a 5" round beam at 10ft from the laser? Will this make it safe if someone happens to look into it? Thank you for you advice. Guy
 





Joined
Sep 12, 2007
Messages
9,399
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113
Yes, 150mW in a >5 inch beam should be safe.

Maximum permissible exposure (MPE) is 1mW/cm². If we assume a top-hat beam profile (to make calculations simpler), at 10 feet, your laser will have power density of:

power/area
150mW/(pi*r²)
150mW/(pi*(6.35cm)²)
1.18mW/cm²

Of course, MPE doesn't mean complete safety at 0.99mW/cm² and instant death at 1.01mW/cm². It is relatively common for lasershows to audience scan at 10x MPE or even 100x MPE in some parts of europe.
 




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