Patent ID: 9439276
Filing Date: 2016-09-06
CPC Classification: G03F,H05G

Claim Text:
1. An extreme ultraviolet light generating system comprising: a laser apparatus configured to provide pulsed laser light inside a chamber in which EUV light is generated; an optical shutter disposed on an optical path of the pulsed laser light; a controller configured to open or close the optical shutter, based on a generation signal supplied from an external unit, the generation signal instructing generation of the EUV light; a light emission trigger generator configured to generate a light emission trigger signal and to supply the light emission trigger signal to the laser apparatus, the light emission trigger signal instructing output of the pulsed laser light; a target feeder configured to feed a target inside the chamber, the target being to be irradiated with the pulsed laser light outputted from the laser apparatus; a detector configured to detect feed timing at which the target is fed from the target feeder and to provide the light emission trigger generator with a first timing signal indicating the feed timing; and a timer circuit configured to generate a second timing signal and to provide the light emission trigger generator with the second timing signal, during absence of the first timing signal from the detector, wherein the light emission trigger generator generates the light emission trigger signal, based on the first timing signal and the second timing signal.