I'm looking for a good laser for optic experiments. All the professional papers I've read show the use of a 351nm Argon Ion laser. A new 30 mW one of these is about $6,000, but I see used ones pop up on Ebay from time to to time. My question is, is there a difference between this laser used in university labs and one of those high-powered Wicked Lasers? I can get a 100mw 405nm laser there for about $100. The specs seem the same or superior...what am I missing? Thanks!