Patent ID: 9574935
Date: 2017-02-21
CPC Classifications: G01J,G03F,H05G

Claim:
1. An extreme ultraviolet (EUV) light generation system configured to irradiate a target material with a laser beam to generate EUV light and to output the EUV light to an exposure apparatus, the EUV light generation system comprising: a laser apparatus configured to output the laser beam to irradiate the target material; a focusing optical system configured to focus the laser beam outputted from the laser apparatus; a target generator configured to output the target material; an EUV light monitor configured to detect a generation position at which the EUV light is generated; and a controller configured to control generation of the EUV light, wherein: when the controller receives an EUV light generation position specification signal specifying a predetermined position as the generation position, the controller adjusts the focusing optical system such that a focus position of the laser beam coincides with the predetermined position and adjusts a position of the target generator to allow the target material to pass through the predetermined position; and upon receiving the generation position detected by the EUV light monitor, the controller determines whether or not the received generation position falls within a permissible range, and, when the received generation position does not fall within the permissible range, the controller adjusts at least one of the position of the target generator and the focusing optical system such that the received generation position falls within the permissible range.