Patent ID: 7835073
Filing Date: 2010-11-16
Classification: G02B,G03F

Abstract:
1. A projection objective, comprising: an optical arrangement of optical elements between an object plane of the projection objective and an image plane of the projection objective, the optical arrangement having at least one intermediate image plane, the optical arrangement, comprising: wherein the projection objective is configured to be used as a lithographic projection objective, and wherein the at least one intermediate image plane includes first and second intermediate image planes, and seen in the light propagation direction, the arrangement of optical elements further comprises: a first subassembly capable of imaging the object plane via a first pupil plane of the projection objective into the first intermediate image plane; a second subassembly capable of imaging the first intermediate image plane via a second pupil plane into the second intermediate image plane; and a third subassembly capable of imaging the second intermediate image plane via a third pupil plane of the projection objective into the image plane, wherein: