Patent ID: 8436328
Filing Date: 2013-05-07
Classification: G03F,H05G

Abstract:
1. An extreme ultraviolet light source apparatus for generating extreme ultraviolet light by irradiating a target material with a laser beam to turn the target material into plasma, said apparatus comprising: a chamber in which extreme ultraviolet light is generated; a target supply unit configured to supply a target material into said chamber; a plasma generation laser unit configured to irradiate the target material within said chamber with a plasma generation laser beam to generate plasma; an ionization laser unit configured to irradiate neutral particles produced from the plasma with an ionization laser beam to convert the neutral particles into ions; a controller electrically connected to said plasma generation laser unit and said ionization laser unit; a laser dumper configured to absorb both the plasma generation laser beam after irradiation of the target material and the ionization laser beam after irradiation of the neutral particles; a collector mirror configured to collect the extreme ultraviolet light radiated from said plasma; a gas introduction unit configured to introduce a gas containing hydrogen at least between said plasma and said collector mirror; and at least one of a magnetic field forming unit configured to form a magnetic field within said chamber and an electric field forming unit configured to form an electric field within said chamber so as to trap said ions.