Patent ID: 8294129
Filing Date: 2012-10-23
Classification: H05G

Abstract:
1. An extreme ultraviolet light source apparatus for generating extreme ultraviolet light from plasma by applying a laser beam to a target material and thereby turning said target material into said plasma, said apparatus comprising: an extreme ultraviolet light generation chamber, in which the extreme ultraviolet light is generated; a target material supply unit for injecting the target material into said extreme ultraviolet light generation chamber when the extreme ultraviolet light is generated; a driver laser for emitting the laser beam; a window provided to said extreme ultraviolet light generation chamber, and for transmitting the laser beam into said extreme ultraviolet light generation chamber; a laser beam focusing optics including at least one optical element disposed within said extreme ultraviolet light generation chamber, and for focusing the laser beam emitted from said driver laser onto a path of the target material injected into said extreme ultraviolet light generation chamber to generate said plasma; temperature sensors for detecting temperature of said window and said at least one optical element disposed within said extreme ultraviolet light generation chamber; and a processing unit for judging deterioration of said window and said optical element according to said temperature detected by said temperature sensors, when the extreme ultraviolet light is generated.