Old 11-30-2014, 01:15 AM #1
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Shiy Shiy is offline
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Default Laser dot safety calculations

Hello everyone,

I recently ordered a 445nm 2W laser, obviously together with it I also bought a pair of safety glasses which I plan to use most of the time.
I am however interested in "how safe" it is to look at the dot of the laser without protection on a non-reflective surface, thus only diffuse reflection.

I used the tool available at:
EASY HAZ? Basic Web Version - Kentek Laser Safety U
To do some calculations, using worst-case scenarios for beam power, diameter and divergence. I set up a sample exposure duration of 30s, meaning I would actively look at the dot for some time.

The results are as follows:


From what I could see the Diffuse NHZ is less than half meter (worst case scenario), meaning it is safe to look at the laser dot at more than that distance, although of course not particularly pleasurable.

Did I interpret the data correctly?
Is it then "safe" to look at the dot of the laser on a matte surface at something more like 2-10 meters (considering you don't hit very reflective surfaces)?

Obviously the best thing would be to always use glasses, but I'm interested about this specific scenario.



Last edited by Shiy; 11-30-2014 at 01:16 AM.
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