You're being blinded more by all the stuff you're reading than what the light emitted from this cube would do. ;-)Steve001
Absolutely, part of the issue though is that all of the safety/hazard information I've read is referring to the hazard of the beam itself, or diffuse reflection. Whats happening in this case is refraction, as the beam is passing through a translucent medium and reflecting many times off of the internal surfaces and varying densities of that medium before it emerges in a diffused/scattered. The difficulty in trying to assess the hazard is that most of the equations require the beam divergence as a variable and that is what I'm having a hard time determining, since the beam starts at about 3mm and expands to something like 60mm in about 5 inches of space. At this point there really isn't a 'beam' anymore, more like a haze or diffused cloud so I'm not sure how I would go about taking measurements of it. This looks significantly different than the diffuse reflection which (if I'm correct) should be safe to view from a few feet away with a 30mw 532nm line module. From what I've read about laser safety the focused beam (or specular reflections and even diffused reflections with powerful lasers) is the hazard because it allows an enormous amount of radiation into the eye which further focuses that onto the fovea, which can either heat the retina or cause a photochemical reaction to damage the retina if the blink reflex doesn't react in time or the beam is a wavelength that isn't visible so doesn't trigger the reflex or is so powerful it can cause damage faster than the reflex can respond. If theres anything I'm missing please let me know, or if you have any links to material about diffused laser light or even diffuse reflections that would be great!
Thanks! Thats what I thought and what I was hoping, but I came to get a few more opinions because I am far from an expert when it comes to lasers and I want to be sure theres nothing Im missing.. safety first! Also thanks for the tip for repliesYou're still having trouble see the trees for the forest. In this specific case there is no hazard because this 30mW beam is being scattered in 6 different directions over a siginificantly wider emitting area. Some of the light is also being absorbed and reemited as heat further reducing the emitted visible light.
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