Ablation cutting of a workpiece by a pulsed laser beam
First Claim
1. A method of parting an optically transparent workpiece, the method comprising:
- pretreating a workpiece surface of the optically transparent workpiece by moving a first pulsed laser beam at a first constant speed over the workpiece surface along a pretreating surface path with a particular path width, wherein first consecutive laser pulses of the first pulsed laser beam have a first pulse overlap on the workpiece surface in a path direction; and
ablating the pretreated workpiece surface of the optically transparent workpiece by moving a second pulsed laser beam at a second constant speed over the pretreated workpiece surface along the pretreating surface path with the particular path width multiple times, wherein second consecutive laser pulses of the second pulsed laser beam have a second pulse overlap on the workpiece surface in the path direction, and wherein the second pulse overlap is less than the first pulse overlap,wherein pretreating the workpiece surface comprises moving the first pulsed laser beam over the workpiece surface along a first plurality of surface paths in the path direction, the first plurality of surface paths being offset laterally from each other and overlapping laterally with each other, andwherein ablating the pretreated workpiece surface comprises moving the second pulsed laser beam over the workpiece surface along a second plurality of surface paths in the path direction, the second plurality of surface paths being offset laterally from each other and overlapping laterally with each other.
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Abstract
A method for ablating a workpiece by a pulsed laser beam includes pretreating a workpiece surface of the workpiece by moving the pulsed laser beam over the workpiece surface along a surface path, first consecutive laser pulses of the pulsed laser beam having a first pulse overlap on the workpiece surface in a path direction, and ablating the pretreated workpiece surface by moving the pulsed laser beam over the workpiece surface along the surface path multiple times. The second consecutive laser pulses of the pulsed laser beam have a second pulse overlap on the workpiece surface in the path direction, and the second pulse overlap is less than the first pulse overlap.
26 Citations
19 Claims
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1. A method of parting an optically transparent workpiece, the method comprising:
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pretreating a workpiece surface of the optically transparent workpiece by moving a first pulsed laser beam at a first constant speed over the workpiece surface along a pretreating surface path with a particular path width, wherein first consecutive laser pulses of the first pulsed laser beam have a first pulse overlap on the workpiece surface in a path direction; and ablating the pretreated workpiece surface of the optically transparent workpiece by moving a second pulsed laser beam at a second constant speed over the pretreated workpiece surface along the pretreating surface path with the particular path width multiple times, wherein second consecutive laser pulses of the second pulsed laser beam have a second pulse overlap on the workpiece surface in the path direction, and wherein the second pulse overlap is less than the first pulse overlap, wherein pretreating the workpiece surface comprises moving the first pulsed laser beam over the workpiece surface along a first plurality of surface paths in the path direction, the first plurality of surface paths being offset laterally from each other and overlapping laterally with each other, and wherein ablating the pretreated workpiece surface comprises moving the second pulsed laser beam over the workpiece surface along a second plurality of surface paths in the path direction, the second plurality of surface paths being offset laterally from each other and overlapping laterally with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification