Wow, that is an awesome DIY Laser. Via https://hackaday.com/2021/03/31/scratch-built-co2-laser-tube-kicks-off-a-laser-cutter-build/
“ Presented is a laser light show utilizing a ds-PIC controller as an arbitrary waveform generator (ARB). The controller allows vector patterns to be either stored in flash (program) memory or uploaded from a PC in a vector format. Analog output, via two 14-bit DACs, is fed to a commercial analog driver board and two high-speed galvo scanners.
The scanner currently resides in the laser lab at Niagara College (in V15) where it is used for both student labs as well as lab demonstrations. A portable scanner, packaged with a HeNe laser, was also created for ‚road show‘ use at promotional engagements – both use the same hardware and software.“