Patent ID: 8093571
Filing Date: 2012-01-10
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 light intensity not greater than a predetermined value and suppressing laser transmission, and the saturable absorber device comprising: a saturable absorber cell having a main body unit that has a flow space where the saturable absorber flows, an inlet for letting the saturable absorber enter the flow space, an outlet for letting the saturable absorber out from the flow space, and a window for passing the output laser beam from the laser oscillator to the flow space; a pipeline for connecting the inlet and the outlet; a transport unit, disposed in the middle of the pipeline, for transporting the saturable absorber that flows out of the outlet, so as to flow into the flow space via the inlet; and a temperature adjustment unit, disposed in the middle of the pipeline, for adjusting temperature of the saturable absorber transported by the transporting unit.