@funranium Nice. The bit about the goggles reminds me of the physics lab I worked in one summer long long ago ... their optical train started with an IR source and went through several frequency doubling steps to get into UV. So, the joke was that the only way we could get eyewear to protect against all those steps was to spray paint it black. Fortunately I never had to go in that lab when it was on, my project involved a 5W argon-ion laser in a different room.

@acsawdey So, as the person who specifies eyewear, I can definitively tell you they fed a line of bullshit.

@funranium ooh, how does eyewear that protects against that work? A bunch of stacked filters, or something cleverer?

@mimir @funranium I'm imagining a comb filter as a solution but I don't recall if those are suitably shaped and cheap enough for use on goggles. but then I've only ever looked at that stuff in the context of the Kerr effect and interferometry. would certainly be interested in knowing how it's actually handled.