Patent ID: 9130345
Filing Date: 2015-09-08
Classification: H01S,H05G

Abstract:
1. An extreme ultraviolet light generation system used with a laser apparatus, the extreme ultraviolet light generation system comprising: a chamber including at least one window for first and second laser beams and a target supply unit for supplying a droplet of a target material into the chamber; a collector mirror provided in the chamber and configured for selectively reflecting at least ultraviolet light emitted from a plasma generated by irradiating the droplet with the first and second laser beams; a first polarization control unit, provided on a light path of the first laser beam, for converting the first laser beam into one of a radially polarized laser beam, an azimuthally polarized laser beam and an elliptically polarized laser beam; and a second polarization control unit on a light path of the second laser beam, for converting the second laser beam into one of a radially polarized laser beam, an azimuthally polarized laser beam and an elliptically polarized laser beam, wherein: the first laser beam strikes the droplet not having been irradiated with a laser beam, and the second laser beam strikes the target material have been irradiated with the first laser beam.