Patent ID: 8476609
Filing Date: 2013-07-02
Classification: H01S,H05G

Abstract:
1. An extreme ultraviolet light source device for generating extreme ultraviolet light, the device comprising: a target material supply unit for supplying target material into a chamber; a laser oscillator for outputting a pulse laser beam; at least two amplifiers for amplifying the laser beam that is output from the laser oscillator; a focusing optical system for irradiating the laser beam after the amplification onto the target material by focusing the laser beam, which is amplified by the amplifier and is output, to a predetermined position in the chamber; and a saturable absorber device, disposed on an optical path between the laser oscillator and the predetermined position, for absorbing at least a laser beam having a light intensity not greater than a predetermined value and suppressing laser beam transmission, the saturable absorber device comprising: