Darren, what is "armarda quattro"?
Go to www.II-VI.com, and ask the CO2 experts your optics questions. We have always used GaAs with AR coating, and had very few problems.
John
vthao- In peeling plastic off of plexiglas, scratch-free, we have used a disposable cardboard tube along one edge, wrap the plastic around the tube to get it started, then roll the tube down the sheet. Could be motorized, but we were cheap labor!
Good luck!
John