Patent ID: 8242472

Claim:
An extreme ultraviolet light source device for generating an extreme ultraviolet light by irradiating a target material with a driver pulsed laser beam for turning the target material into plasma, comprising: a target material supply part that supplies the target material into a chamber; a driver laser device that outputs the driver pulsed laser beam; an optical system that guides the driver pulsed laser beam to the target material; a guide laser device that outputs a guide laser beam; a guide laser beam introduction part that introduces the guide laser beam into the optical system; a guide laser beam detection part that detects the guide laser beam that is introduced into the optical system; a correction part including at least one optical element to which the driver pulsed laser beam and the guide laser beam are introduced, the correction part being configured to rotate, move, or deform the at least one optical element to correct the driver pulsed laser beam; and a correction control part that controls the correction part based on the detection by the guide laser beam detection part.