Patent ID: 7705334

Claim:
An extreme ultraviolet radiation source device comprising: a vessel; an electric discharge section including a pair of main discharge electrodes; a material supply unit which supplies an extreme ultraviolet radiation species to the electric discharge section; a high voltage generating section which impresses high voltage to the pair of main discharge electrodes; a grazing incidence type collector mirror which has a through hole, and condenses extreme ultraviolet light emitted from the electric discharge section through the through hole; a light extraction section formed in the vessel; a gas supply unit which supplies gas into the vessel from a light emitting side of the collector mirror; an exhaust unit which exhausts the gas from a light incidence side of the collector mirror, wherein the gas supplied from the light emitting side of the collector mirror passes through only-the through hole of the collector mirror and the gas passes through the through hole simultaneously as the grazing incidence type collector mirror condenses extreme ultraviolet light.