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Green laser pointers
By Technology Planet.co.uk
Green laser Diode - & laser background Green class of lasers, IIIa, which by law must be less than 5mW (of measured optical output). This class is legal to sell in the United States, United Kingdom and legal to operate outside in the United States, and UK provided you don't do anything stupid. Shining the laser at aircraft in flight, or moving cars, and peoples eyes or other equally silly acts can easily land you in prison or a huge fine. Apparently a man who wanted to see if he could hit airoplanes as they were landing was in fact successful. Thankfully, none of the pilots crashed, but the man was reported to have received a seven year prison sentence.
The next higher class, IIIb ranges from 5 to 500 mW. You can also legally purchase this class of laser in the United States, and United kingdom But there are restrictions on it's use, because these lasers are capable of permanently damaging vision, and burning objects You can't use it in an environment where the beam could escape to the outside. To be explicit here, this means you can't legally use them outside, unless on private land with nobody around. Now you may want to adopt a "no blood, no foul" attitude, and that's fine for you. But just know that if you ever make a mistake, or run into a narrow-minded individual, you don't have a legal leg to stand on - prepare for a good screwing. Furthermore, based on my own 5mW product, there is no reason outside of inferiority complex to get a higher power product for astronomical use, as the 5mw Green laser is highly visible in day & at night. So how safe are these things? (the 5mW class IIIa version)? They won't burn you. They won't cause permanent eye damage. Tests were performed on individuals who were scheduled to have an eye removed for medical reasons. For the purposes of the test, the eye was normally functioning. Test subjects stared directly at 5 mW lasers with there to-be-removed eye for five to fifteen minutes from various angles. No permanent eye damage occured at all. Some changes in tissue were noticed. Of course, in a real-world incident, laser light entering the eye would likely last for less than one second, as people naturally look away from bright things and close their eyes, so there is no real danger of direct damage from low mW lasers Having said that, these things are damn bright. If you hit a car driver at night with this, he'd be effectively blinded for at least a few seconds afterwards -- long enough to crash and die and have you go to prison for manslaughter. These are not toys for children. They should never be shined at people, cars, planes, friends for fun, or anything other than to use for pointing purposes or astronomical use. Finally, why green? Our eyes are most sensitive to green light than the red laser diode, which is cheaper. The same measured power output of a red laser would not produce a visible beam, because our eyes aren't as sensitive to red. By the time we could see a red laser, it would probably be reaching a dangerous level of intensity - Dont bother.
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