No, it cannot. In consideration of the type of material, the laser is only suitable for surface marking.

The glass maximum engraving depth is no more than some hundred microns, since glass melts when laser passes by and while cooling down it settles on the engraving edges and a minimum part only evaporates.

That sometimes occurs. It depends on the type of glass, the surface finish, the working parameters set that should be only slightly ‘invasive’.

Yes, they can be marked since the laser marking is carried out on the back and the metal deposit is completely removed leaving glass – where the laser beam passes by – transparent.