Wow, nice score, and thanks for sharing. That's really cool.
I'm all for it. The optics and optical alignment will be interesting especially with an invisible beam. What are you thinking optics wise? a fiber would get rid of most of the nasty alignment issues, and be safer to work around, one point of getting fried vs. several. I'm guessing the dental laser is fiber based, hopefully the power and wavelength would be compatible.
Does it have water cooling?
Can you tell us the make and model?
I was actually checking out some videos of Coherent 40 and 60 watt laser diodes of this type, suitable for light metal cutting, crazy stuff. I can't find it now but one guy was holding the fiber like a pencil and cutting a tin can with it.
Location wise, I think out of the classroom for sure, and at least a partial enclosure with ventilation.
I'm ready to help with whatever we need; time, money, effort, you may want to keep me away from any soldering though.