Another project I've been working on has been an RGB laser projector. I found a cheap RGB laser Christmas decoration, and extracted the lasers from it. They were surprisingly powerful. I then found the PWM control line on the power board, and PWMed the lasers, but I managerd to burn out the green laser by overdriving it. I purchased a new one, and some dichroic glass. One piece passes red light, but reflects blue and green. The other passes red and green, but reflects blue. Now I just need to print up some adjustable jigs so I can aim the lasers and get them all pointed in the right direction.

A benefit of this laser expedition is that I can learn about constant current drivers for lasers. I eventually want to digitally control the laser intensity so I can make a fancy vector display. Also, laser diodes are cheap, and now I have a selection of red, green, blue, UV (Well 405nm), and IR (800?nm), housings and heatsinks. Should be even better when I pick up the galvos...