![]() ![]() It relates to 'solar' radiation but the interesting conclusions were the fact that certain frequencies "oxidise" the chemical structure of the eye releasing 'free radicals" more so than other frequencies. Okuno, Tsutomu (2008) Hazards of solar blue light. I've been looking for my papers on 'Blue' light and free radical damage to optical systems, but its been 3 years all I can find is this: Take a laser, shine it in a mirror and look into the mirror, Yes I know it is an 'exaggeration' but it will give you a faster result than the laser being reflected from another surface. Yes you are correct, but what is a 'coherent' source? ![]() ![]() High wattage is also an issue, so I can believe that non-coherent light could be a problem if it is high-powered enough. LEDs and reflected laser light is no longer coherent. When you see a laser beam/spot, exactly what do you think you are looking at? the lazed photons are STILL entering your retina otherwise you could not see them, just the damage takes longer.Can you link to some of the research that you mention? I thought that the only reason lasers were dangerous to the eye is because of the coherent beam. *it always amazes me that people think that once laser light has bounced, it is somehow magically different. When you see a laser beam/spot, exactly what do you think you are looking at? the lazed photons are STILL entering your retina otherwise you could not see them, just the damage takes longer. Read the research, guarantee you will not be looking directly at modern LED's again. Then there is the issue of lasers that are out of your "visible" spectrum, they will STILL damage your retina, this also includes the new LED diodes especially BLUE. If you can "see" the beam /dot you are already in danger of going blind.*. Really this thread needs a very significant safety warning, lasers are NOT toys they are a danger to yourself and the people around you, and unless you are prepared to pay several hundred $ for safety equipment, your risking your long term vision. Thought I would mention in case anyone really is interested in building one. Technically even 980nm can be seen if your hit straight in the eye but its a lot less visible then 808 at least. has one, not sure if its suitable since divergence (beam spread) isn't listed. Also the crystals aren't all that efficient so the 808nm diode is much more powerful (dangerous) then the resulting green 532nm beam.Ī 5mW 980nm laser would be better. 808nm is listed as IR but when powerful or focused it can been seen as dim red. Not all IR is created equal(ly invisible). The Laser Community site also seems to reveal that green laser pointers are actually IR lasers with a crystal that cuts the frequency in half and shifts the IR to green. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |