Patent ID: 6483071
Filing Date: 2002-11-19
Classification: B23K,G03F

Abstract:
A method for precisely positioning a waist of a material-processing laser beam to dynamically compensate for local variations in height of microstructures located on a plurality of objects spaced apart within a laser-processing site, the method comprising:providing reference data which represents 3-D locations of microstructures to be processed within the site wherein the step of providing includes the steps of measuring height at a plurality of locations about the site to obtain reference height data, computing a reference surface based on the reference height data and generating trajectories for the microstructures and the waist of the laser beam based on the reference surface; positioning the waist of the laser beam along an optical axis based on the reference data; and positioning the objects in a plane based on the reference data so that the waist of the laser beam substantially coincides with the 3-D locations of the microstructures within the site.