After drawing inspiration from @dkj4linux 's thread HERE I bought some 4x4 mirror tiles and tried some lazing.
Lighted room, unlit
Lighted room, lit
Dark room, lit
This was just burning the backing off, image reversed, at 1200mm/min, 80% pow, 30(7)watt NEJE laser.
It ablated the glass as it burned the backing, leaving a frosted finish. Zooming in you can see the stair-stepping on the shapes. I think I need to adjust my line interval a bit. This was at .1mm. This was just an quick test with an easy shape I had from when I made some slate coasters, I’m actually more of a VW fan 