The other day i was surfing through youtube when i came across a rather large amount of laser videos. Many how to vids all the way to laser technology institutes. It peaked my interest so i began planning on building my own. I've come across many different kinds of diodes and can't decide. Any suggestions on what is a good type to start with? Also im having trouble finding a 100 ohm POT that isnt Linear Taper. Any input would be greatly appreciated.