 445nM radiation hazards?
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dmg
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Thu Nov 18 2010, 05:09AM
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Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
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Aside from the usual eye/retina damage possibility.
I wondered what are some distinct hazards of laser light that other light sources do not pose?
so far I only see harm in it from vision and burn hazards, and I would like to know if anyone else here knows what other ill effects could result from exposure to this radiation (to body/skin mostly, as eyes are covered).
Thank you.
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Bjørn
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Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
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Light at wavelengts above 400 nm are generally not considered to be a problem in normal cases.
Search for "spectral effectiveness" to find quite a lot of information.
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Conundrum
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
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according to some articles wavelengths shorter than 450nm can cause skin damage similar to UVA with much lower effectiveness.
the main concern I'd have is that due to the far smaller focal spot the damage can extend quite deep into the skin compared with a longer wavelength (i.e. red) and potentially cause quite a serious burn even at low power.
Others have mentioned the tendency of the 445nm diodes to "jump" in power unexpectedly when near their threshold with only a milliamp more current, resulting in a hazardous beam if reflected off a nearby object such as an alignment tool etc.
see laserpointerforums for more information..
-A
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