Patent ID: 7206058

Claim:
A lithographic projection apparatus comprising: a radiation system constructed and arranged to condition a beam of radiation including an EUV radiation; a patterning device support constructed and arranged to support a patterning device, said patterning device being configured to pattern the beam of radiation including the EUV radiation to form a patterned beam of radiation; a substrate support constructed and arranged to hold a substrate; an exposure station having a projection system configured to project the patterned beam of radiation including the EUV radiation onto target portions of the substrate; a sensor constructed and arranged to measure a position of each of a plurality of points on a surface of said patterning device in a first direction perpendicular to said surface so as to generate a height map of said surface of said patterning device; and a controller configured to control a tilt of said patterning device support about at least one direction substantially perpendicular to said first direction based on said height map.