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These are Class 3 (>5mW) LASERS and general public can not use it without a license. You can use Class - 1 (<1mW) or Class 2 lasers (>1mW and < 5mW) which requires no license but the power is not sufficient to even burn a hole in a paper.
and i have a question.....
does a cd -rom use class 1, and a cd-rw class 3?
and another ting, i heard somebody invented a specil disk that has multiple tracks, and there is a laser beam for reading each track, something similar to a dvd.
does anybody know anything about that?
so OOTWINE, you mean that my cd player uses class 2? it think tha for portable is enough class1, but i agree with the cr-rw, you need lots of power.
but why qould you need such power for a cdrom?
ill chect the next time ill open my computer, because it is quite hard to see.
hmm Im not sure what youre trying to get at, but I didnt say anything about cd laser classes.
Im thinking about building a robot, so extra things likes lasers and tazers are add ons im considering. If a cd-rw laser isnt powerful enough to burn anything other than someone's retina, then there isnt point trying to modify one to use on there.
To successfully burn something with a low power laser around 20mW, you would definately need to focus to a point, and would have to be held at a localised point for a while(would not work over a distance of more than 5 cm).Black electrical tape is best for testing with as it has good light absorbtion properties. To make use of burning something using the straight output from a laser itself, you would need a min of 150mW (this would only work with a distance of upto 20cm), higher powers would enable burning over greater distances.
I used to have a 1watt Argon-ion that I could burn the plastic on the top of my washing machine with, distance was about 3 metres from laser to WM. This was great but no way portable as weighed too much and consisted of PSU's, transformers and a connection to 240vac @ 20amps.