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Alright, I'm making a custom burning laser lighter, something I'm sure others have done, and I have a few questions. Battery size is a major concern for me, and since I'm using a high powered infrared laser (1W, 808nm) it takes a lot of juice. I've obtained a driver that can limit the...

Alright, this is probably a noob question, but I can't seem to find any other threads that explain it (not saying there isn't one, I've just given up on looking). I did however find that basically from your LD wavelength, you can determine what the focus can be, which if I remember right is 1/2...