I am putting things together to do some evaporative coating. What purity of MgF2 is normally used for AR coats? I am having a hard time finding that info.
My system here:
http://projects.hackaday.com/project...for-Deposition
I plan on adding a small 3 pocket ebeam setup and maybe a couple small sputter heads. Hoping to do dielectric filters and other optics.