Patent ID: 8471226

Claim:
An extreme ultraviolet light source device that generates extreme ultra violet light by irradiating laser beam on a target material for turning into a plasma thereof, comprising: a target material supply section that supplies the target material; an ionization section that ionizes the target material supplied from the target material supply section; a plasma generation chamber that is supplied with the ionized target material and generates a plasma; and a plasma generation laser light source that irradiates laser beam on the target material supplied to a predetermined area in the plasma generation chamber to turn into plasma the target material, thereby emitting extreme ultra violet light, wherein: the ionization section ionizes the target material by irradiating laser beam thereon, and the ionization section includes: a vaporization laser light source that vaporizes the target material supplied from the target material supply section by irradiating vaporization laser beam on the target material; and an ionization laser light source that ionizes the target material vaporized by the vaporization laser beam by irradiating ionization laser beam on the target material.