Patent ID: 8139200
Filing Date: 2012-03-20
Classification: B82Y,G02B,G03F,G21K

Abstract:
1. A lithographic apparatus comprising: a support configured to support a patterning device; a substrate table configured to hold a substrate; a projection system configured to project a pattern imparted to a radiation beam by the patterning device onto a target portion of the substrate; and a first multi-layer mirror and a second multi-layer minor, the first multi-layer mirror and the second multi-layer mirror being arranged along a path of the radiation beam, the first multi-layer mirror and the second multi-layer mirror each having a reflectivity of at least about 50% in extreme ultra violet wavelength range, and the first multi-layer mirror configured to reduce radiation having wavelengths in a first wavelength range and the second multi-layer mirror configured to reduce radiation having wavelengths in a second wavelength range different from the first wavelength range, wherein the first wavelength range and the second wavelength range are outside extreme ultra violet wavelength range.