I've had a little bit of experience on the laser end, but not the
Amiga interface end.
Meridith Instruments (Someplace in Arizona, they usually advertise in
electronics hobby mags.) carries all the stuff you need to put
together laser systems up to 3 watts (with proper liscensing).
Although it's been about 4 years since I got my last catalog from
them… they did use to carry a program which used the Amiga audio
port to control laser imaging software… but the name escapes me.
I'll try to track down the number for you , if I still have it
around.