Patent ID: 8943855
Filing Date: 2015-02-03
Classification: C03B,Y10T

Abstract:
1. A method of cutting an article from a chemically strengthened glass substrate comprising: generating a pulsed laser beam from a laser source, the pulsed laser beam having a pulse duration less than about 1000 fs and an output wavelength such that the chemically strengthened glass substrate is substantially transparent to the pulsed laser beam; focusing the pulsed laser beam to form a beam waist; positioning the beam waist of the pulsed laser beam such that the beam waist is located in the same horizontal plane as an inner tensile region of the chemically strengthened glass substrate; translating the beam waist in a first pass along a cut line, thereby forming a molten defect line within the inner tensile region of the chemically strengthened glass substrate, wherein the beam waist traverses an edge of the chemically strengthened glass substrate; and translating the beam waist in a second pass along the cut line that retraces the first pass, wherein the beam waist traverses the edge of the chemically strengthened glass substrate and travels along at least a portion of the molten defect line formed by the first pass such that a crack propagates from the edge of the chemically strengthened glass substrate along the cut line ahead of the translated beam waist during the second pass.