Patent ID: 7915600
Filing Date: 2011-03-29
Classification: B82Y,G03F,H05G

Abstract:
1. An extreme ultra violet light source apparatus which generates extreme ultra violet light by applying a laser beam to a target, said apparatus comprising: a chamber in which extreme ultra violet light is generated; a target supply unit which supplies one of tin and lithium as a target to a predetermined position within said chamber; a CO a collector mirror which has a multilayer film on a reflecting surface thereof and collects the extreme ultra violet light radiated from the plasma to output the extreme ultra violet light; a first detector which detects an amount of neutral particles emitted from the plasma; a second detector which detects an amount of ions emitted from the plasma; and a control unit which obtains an amount of neutral particles deposited on said reflecting surface of said collector mirror based on a detection result of said first detector and an amount of said multilayer film worn away from said reflecting surface of said collector mirror based on a detection result of said second detector, and thereby adjusts a pulse width and/or energy of the laser beam radiated from said CO