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To make a better example, let's say you're running a milling machine. Why not use colliminated light? You could pick up 10kw monochromatic lights a lot easier than lasers. Are interference losses really that imporatant? Understandably a laser diode produces "cleaner" output than an LED, I was...

:( Ouch. So 100% DIY is not going to work. Thanks for the tip on NiMH batteries anyway... I'll just have to get myself a cheap laser pointer or lens someday. Something else I've been wondering... if you have to collimate the laser, then what's the point of using a laser instead of a high-power LED?

Thanks for the replies. When the batteries start going bad, I'll replace them. I don't plan on running this for minutes at time or anything. The reason for running it at low power is to run it for long periods of time without risking heat damage or anything. I am aware of the many colliminated...

Some background on the DVD burner (skip on if you want, just note I don't want to open it up until I'm sure this project has a good chance): A few months ago, I bought an OQO on ebay. Of course the stock unmodified WinXP Home sucked for performance, and a USB DVD burner was quickly obtained to...