METHOD FOR LASER-SUPPORTED DETACHING OF A PORTION OF A FLAT GLASS OR GLASS-CERAMIC ELEMENT

摘要

The invention relates to a method for detaching a portion of a flat glass or glass-ceramic element (2) along a provided separation line (21), which divides the glass or glass-ceramic element (2) into the portion to be detached (4) and a main portion (3) which is to remain (3), wherein filament-like instances of damage (20) are generated in the volume of the glass or glass-ceramic element (2) next to one another along the separation line (21), and the filament-like instances of damage (20) are created by laser pulses (12) of a laser (10), wherein the material of the glass or glass-ceramic element (2) is transparent to the laser pulse (12), and the impact points (13) of the laser pulse (12) on the glass or glass-ceramic element (2) are moved over the surface (22) thereof along the separation line (21), and after the filament-like instances of damage (20) arranged next to one another along the separation line (21) have been generated, material of the glass or glass-ceramic element (2), which is located in the region of the portion (4), undergoes a phase transition and is caused to contract, so that the portion (4) is detached from the main portion (3) along the separation line (21) at the adjacently arranged filament-like instances of damage (20), wherein at least the main portion (3) is kept intact.