Oh, that’s neat. It uses high-harmonic generation.

My sole personal experience with any sort of harmonic generation was being in the room while some grad students debugged a 266nm laser that consisted of a boring 1064nm Nd:YAG laser followed by two frequency doublers. Quite a lot of power was lost in each stage, and the results of accidentally letting the full 1064nm source power loose were mildly spectacular.

I wish Lumiverse luck getting any appreciable amount of power out of their system. (FELs, in contrast, seem to be cable of monstrous power output — that’s never been the problem AFAIK.)

P.S. never buy a 532nm laser from a non-reputable source. While it’s impressive that frequency doubled Nd:YAG lasers are small and cheap enough to be sold as laser pointers these days, it’s far too easy for highly dangerous amounts of invisible 1064nm radiation to leak out, whether by carelessness or malice. I have a little disreputable ~510nm laser pointer, which I chose because, while I don’t trust the specs at all, 510nm is likely produced directly using a somewhat unusual solid state source, and it can’t be produced at all using a doubled Nd:YAH laser. The color is different enough that I’m confident they’re not lying about the wavelength.