Patent ID: 8094288
Filing Date: 2012-01-10
Classification: G03F

Abstract:
1. A lithographic apparatus comprising: an illumination system configured to transmit a beam of radiation, the beam of radiation comprising desired radiation having a predetermined wavelength or a predetermined wavelength range, and undesired radiation having another wavelength or another wavelength range; a support structure configured to support a patterning structure, the patterning structure being configured to impart the beam of radiation with a pattern in its cross-section; a substrate table configured to hold a substrate; and a projection system configured to project the patterned beam of radiation onto a target portion of the substrate; wherein at least part of the lithographic apparatus, during substrate exposure, comprises a gas substantially transmissive for at least part of the desired radiation and substantially less transmissive for at least part of the undesired radiation, said part of the lithographic apparatus including the illumination system and/or the projection system.