Hi @ All! Engraving Glass works fine with a 2500mW Laser.
The Glass or transparent material just needs a catalyst.
For first tries take a simple PVC-Sticker. Even a line of a textmarker does.
For best results:
Just get a "window-sun-protection-foile" - self adhesive throu static-load (not the ones with glue for cars).
Cut a piece you need and put it on the glass as described.
Put the glass on a non-burning material (best with a distance-holder between)
Put it under the Laser - and focus (!)
OPEN THE WINDOW (Yes, the real window of your Room, not on PC! (Burning Plastic isn't healthy!))
Start your Projekt!
Clean / rub the glass with acetone or so...
Settings: Laser 255 MAX (0-255)
Speed Line-Mode ~ 50 (0-1500)
Speed Grid-Mode ~ 250 (0-1500)
The setting is almost the same a the settings for 'just' cutting the foil.
So I think the foil is a simple catalyst.
The micro-burning of the foil damages the glass.
By the way:
My first try was engraving a transparent CD-Cover.
I took a Text-Marker to color the plastic. It works fine!
In photos you get the best results by dithering (black/white - no greyscale)
or preparing it by using effects converting to b/w.
Greetings in the Nachbarschaft
(to my german neighbors)