Glass can be processed quite well with a laser. Depending on the setting and energy input, material can be removed (ablation). For example, to create rectangular cavities (blind holes), into which LEDs are later embedded, keeping a flat surface.
Filamentation can be used to cut glass, similar to waterjet cutting, but with much smoother edges that do not require any further processing.
The laser can also be used to structure surfaces or, for example, to embed logos and markings in the glass, thus individualizing products or making life difficult for product piracy.