Patent ID: 9277635
Filing Date: 2016-03-01
CPC Classification: H01J,H05G

Claim Text:
1. An extreme ultraviolet light generation method for generating extreme ultraviolet light, comprising: outputting a target from a target supply device toward a first predetermined region inside a chamber, the chamber being provided with a through-hole; detecting the target passing through a second predetermined region by irradiating the second predetermined region with light and by detecting light incident on an optical sensor from the second predetermined region, the second predetermined region including part of a trajectory of the target between the target supply device and the first predetermined region, and the second predetermined region being a region that is longer along a direction perpendicular to a direction of movement of the target and perpendicular to an optical path of the light with which the second predetermined region is irradiated than along the direction of movement of the target; and irradiating the target with a pulse laser beam introduced into the first predetermined region through the through-hole, on a basis of a timing of detecting the target passing through the second predetermined region, to turn the target into plasma.