Patent ID: 9578730
Date: 2017-02-21
CPC Classifications: H05G

Claim:
1. An extreme ultraviolet light generation system comprising: a first laser apparatus configured to output a first pulse laser beam; a second laser apparatus configured to output a second pulse laser beam; a chamber; a target generation unit configured to output a target to a predetermined region in the chamber; a laser controller configured to control the first laser apparatus and the second laser apparatus so that the target is irradiated with the first pulse laser beam, the target being turned into a secondary target by being irradiated with the first pulse laser beam, and so that the secondary target is irradiated with the second pulse laser beam; a focusing optical system configured to concentrate the first pulse laser beam to the target and concentrate the second pulse laser beam to the secondary target; a plurality of scattered light detectors each configured to detect both scattered light from the target irradiated with the first pulse laser beam and scattered light from the secondary target irradiated with the second pulse laser beam; and an EUV light generation controller configured to control at least an optical path of the first pulse laser beam on a basis of results of detection of the scattered light from the target irradiated with the first pulse laser beam and then control an optical path of the second pulse laser beam on a basis of results of detection of the scattered light from the secondary target irradiated with the second pulse laser beam.