Method and device for the laser-supported detachment of a section from a planar glass element

Abstract

A method is provided for detaching a section (4) from a planar glass element (2) along an intended parting line (21) which divides the glass element (2) into a section (4) to be detached and a main part (3) to be left, wherein - filamentary damaged portions (20) are created in the volume of the glass element (2) alongside one another along the parting line (21), and - the damaged portions (20) arecreated by laser pulses (12) of an ultrashort pulse laser (10), wherein the material of the glass element (2) is transparent to the laser pulses (12), and - the laser pulses (12) create a plasma in the volume of the glass element (2), said plasma causing the filamentary damaged portions (20), and - the striking points (13) of the laser pulses (12) on the glass element (2) are moved over the surface (22) thereof along the parting line (21), and - after the introduction of the filamentary damaged portions (20) arranged alongside one another along the parting line (21), the glass element (2) isheated in the region of the main part (3) and made to expand and / or is cooled in the region of the section (4) and made to contract, such that the section (4) detaches from the main part (3) along theparting line (21) at the filamentary damaged portions (20) located alongside one another, wherein the section (4) and the main part (3) are each retained as whole parts.

Description

technical field [0001] The present invention generally relates to laser assisted separation of a subsection from a flat glass element. The invention relates in particular to a laser-assisted separation of a subsection from the interior of a flat glass element. Background technique [0002] It is known from WO 2012 / 006736 A2 that high-energy laser pulses can cause irreversible filament-shaped damage on glass substrates, and that the adjacent arrangement of these damages in the glass enables the separation of the glass. The filaments consist of ultrashort laser pulses in which self-focusing occurs due to the Kerr effect in the interior of the glass until the energy density in a certain point is so high that the plasma is ignited. A plasma explosion occurs in which glass suffers irreversible damage around the location where the plasma is generated. From there further radiation begins, which suffers from self-focusing and which ends in another plasma explosion. This effect re...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: on the one hand, the high outlay, which reduces the economic efficiency, and on the other hand, the destruction of the subsection to be separated, because it is exactly the same as the remaining main part of the substrate. It may be of interest to fit the shape of

Furthermore, the disadvantage of destroying this subsection is: the resulting particles and debris and thus increased cleaning costs

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