Patent ID: 7276710

Claim:
A light source unit for supplying light radiated from plasma, said light source unit comprising: a stabilizer for reducing a fluctuation of a position of the light radiated from the plasma; a target supply unit for supplying a target; a laser unit for generating the plasma, the laser unit including a laser generator for emitting a laser beam and a condenser for condensing the laser beam; and and optical element for condensing the light emitted from the plasma, wherein said stabilizer includes: at least one of a first detector for detecting a position of the light, a second detector for detecting a position of the plasma, a third detector for detecting a position and/or an angle of said optical element, and a fourth detector for detecting a position and/or angle of the condenser; at least one of a first adjuster for adjusting a position and/or angle of said optical element, a second adjuster for adjusting a position and/or angle of the condenser, and a third adjuster for adjusting a position and/or angle of said target supply unit; and a controller for controlling at least one of the first to third adjusters so as to maintain a position of the light in place based on a detection result by at least one of the first to fourth detectors.