Patent ID: 7469831
Filing Date: 2008-12-30
Classification: B23K,B33Y,B41M,G06K,H01L,H05K

Abstract:
1. A method for processing targeted surface material within a region of a workpiece while avoiding undesirable changes to adjacent non-targeted material, the method comprising: generating a pulsed laser output including at least one pulse having a wavelength and a pulse width; irradiating the targeted surface material of the workpiece with the pulsed laser output including the at least one pulse to texture the targeted surface material, the pulsed laser output having sufficient total fluence to initiate ablation within at least a portion of the targeted surface material and the pulse width being short enough such that the region and non-targeted material surrounding the region are substantially free of defects; generating a secondary laser output; and irradiating the textured surface material with the secondary laser output to process the textured surface material wherein the textured surface material comprises indicia and wherein at least a portion of the indicia are erased during the step of irradiating with the secondary laser output and wherein the defects include slag, debris, and microcracking.