im still a bit confused on how to make it and Im not sure if can use an old pair of glasses as the concave lens, also im not what i should use to cut the lens! Thanks for all the help! no i didnt see that one ill have a look now!
So you're going to make your own laser from a burning diode? You need:
-An Aixiz housing
-A host to keep the laser, power source and circuitry in (eg flashlight, project box)
-A driver to regulate current to the diode
-Power source (several normal batteries or a few lithium batteries in a holder)
You can build one for about $40. There are step-by-step tutorials here on exactly how to do it, such as kenom's Dorcy Junior flashlight hack.