Patent ID: 7880153
Filing Date: 2011-02-01
Classification: G03F

Abstract:
1. An extreme ultra violet light source apparatus for generating extreme ultra violet light by applying a laser beam to a target material, said apparatus comprising: an extreme ultra violet light generation chamber in which extreme ultra violet light is generated; a target material supply unit which supplies a target material into said extreme ultra violet light generation chamber; a laser source which applies a laser beam to the target material supplied into said extreme ultra violet light generation chamber to generate plasma; collection optics which collects extreme ultra violet light radiated from said plasma; a filter which filters the extreme ultra violet light collected by said collection optics; and a filter protecting member which is provided between said plasma and said filter, and which protects said filter by blocking flying matter flying from said plasma toward said filter, said filter protecting member having a size and being located such that said filter is substantially contained within a hypothetical cone defined by side ends of said filter protecting member with a plasma generation position as an apex.