Patent ID: 7626188

Claim:
Extreme ultraviolet light source device, comprising: a vessel, a raw material supply means for supplying a liquid or solid raw material to the vessel for radiation of extreme ultraviolet radiation, an energy beam radiation means for generating an energy beam for irradiating the raw material and gasifying the raw material, a pair of discharge electrodes separated by a gap for high-temperature excitation of the gasified raw material and generation of a high-temperature plasma by means of electrical discharge in the vessel, a pulsed power supply means for supplying pulsed power to the discharge electrodes, a collector optical means for collecting extreme ultraviolet radiation emitted by the high-temperature plasma produced in a discharge region produced by the pair of discharge electrodes, and an extreme ultraviolet radiation extractor that extracts the collected extreme ultraviolet radiation, wherein the energy beam irradiation means is positioned so as to irradiate the energy beam on raw material supplied to a space other than the discharge region, from which the gasified raw material can reach the discharge region.