Patent ID: 8692220
Filing Date: 2014-04-08
Classification: H01S,H05G

Abstract:
1. An extreme ultraviolet light source apparatus that generates an extreme ultraviolet light by irradiating a target material with a driver pulsed laser beam for turning the target material into plasma, comprising: a chamber; a prepulse laser device configured for outputting a prepulse laser beam; a prepulse guide laser device configured for outputting a prepulse guide laser beam; a first delivering mirror configured for synchronizing traveling directions of the prepulse laser beam and the prepulse guide laser beam; a driver pulsed laser device configured for outputting the driver pulsed laser beam; a driver pulsed guide laser device configured for outputting a driver pulsed guide laser beam; a second delivering mirror configured for synchronizing traveling directions of the driver pulsed laser beam and the driver pulsed guide laser beam; a mirror configured for reflecting the prepulse laser beam passing through the first delivering mirror and transmitting the driver pulsed laser beam passing through the second delivering mirror; a focusing system configured for guiding the prepulse laser beam reflected by the mirror and the driver pulsed laser beam passing through the mirror to the target material; a first correction part located between the first delivering mirror and the focusing system, including a first optical element where the prepulse laser beam enters, and configured for rotating, moving or transforming the first optical element; a second correction part located between the second delivering mirror and the focusing system, including a second optical element where the driver pulsed laser beam enters, and configured for rotating, moving or transforming the second optical element; a sensor located between the mirror and the chamber; and a controller configured for controlling at least one of the first correction part and the second correction part based on a detection result of the sensor.