Patent ID: 8184896
Filing Date: 2012-05-22
Classification: G01J,G03F

Abstract:
1. A method of determining a quality of a light source applied to a photolithographic process, comprising: a) exposing an image sensor array to a light from the light source; b) collecting addresses and respective intensities corresponding to a plurality of locations on a pupil map representing intensity of the light from the light source on the image sensor array; c) summing together the intensities to calculate a total intensity of the light from the light source collected by the image sensor array; d) defining at least one of an inner curve or an outer curve on the pupil map, the at least one of the inner curve or the outer curve having a radius that corresponds to a percentage of the total intensity of the light collected by the image sensor array; and e) applying the light source to a photolithographic process for forming a device on a semiconductor wafer if a predetermined amount of a normalized intensity contour line is disposed externally of or within the at least one of the inner curve or the outer curve, respectively.