You forgot WITH LASERS, and IN A VACUUM
IIRC from the Veritasium video[0] there is actually some hydrogen gas flowing at quite a high speed though the laser chamber to carry away the tin debris so that it does not accumulate on the mirrors.
[0] https://www.youtube.com/watch?v=MiUHjLxm3V0
The old SemiAccurate article https://semiaccurate.com/2013/02/13/euv-moves-forward-two-st... was very funny.
IIRC from the Veritasium video[0] there is actually some hydrogen gas flowing at quite a high speed though the laser chamber to carry away the tin debris so that it does not accumulate on the mirrors.
[0] https://www.youtube.com/watch?v=MiUHjLxm3V0