Patent ID: 8476552
Filing Date: 2013-07-02
Classification: B23K,H01L,H01S

Abstract:
1. A method for processing a workpiece with a laser, the method comprising: storing data corresponding to a plurality of temporal pulse profiles, each temporal pulse profile associated with a respective target class of structure on or within the workpiece, wherein one of the plurality of temporal pulse profiles comprises a triangular shape that increases at a first constant rate from an initial power value at a first time to a peak power value at a second time and decreases at a second constant rate from the peak power value at the second time back to the initial power value at a third time; selecting a structure on or within the workpiece for processing, the selected structure being associated with the temporal pulse profile comprising the triangular shape; selecting the first constant rate to control a rate of heating the selected structure during a period between the first time and the second time; selecting the second constant rate to control a rate of cooling the selected structure during a period between the second time and the third time, wherein the second constant rate is different than the first constant rate; based on the selected structure, selecting the temporal pulse profile comprising the triangular shape from among the plurality of temporal pulse profiles; generating a laser pulse comprising the selected temporal pulse profile; and directing the generated laser pulse to the workpiece so as to process the selected structure with the generated laser pulse.