Patent ID: 9217930
Filing Date: 2015-12-22
Classification: G02B,G03F

Abstract:
1. An optical system, comprising: a light source; an optical integrator comprising a plurality of first optical subelements, the optical integrator being configured to produce a plurality of secondary light sources each emitting a light bundle during use of the optical system; a condenser configured to effect a superposition of the light bundles in a field plane during use of the optical system; a first scattering structure comprising a plurality of second optical subelements, the first scattering structure being before the optical integrator in a light propagation direction of the optical system, each second optical subelement being configured to produce a substantially rectangular angular light distribution during use of the optical system; and a second scattering structure between the optical integrator and the condenser along the light propagation direction of the optical system, wherein the optical system is a micro lithographic illumination system.