公开(公告)号：US20190045616A1

公开(公告)日：2019-02-07

申请号：US16156356

申请日：2018-10-10

Applicant: Gigaphoton Inc.

Inventor： Yuta TAKASHIMA ,  Yoshifumi UENO ,  Go SHIROZU

IPC: H05G2/00 ,  H01S3/09

CPC classification number: H05G2/008 ,  H01S3/09 ,  H05G2/003

Abstract: An extreme ultraviolet light generating apparatus includes a laser device, a target detector, and a controller. The laser device emits a pulsed laser beam. The target detector detects a target substance supplied as an application target for the laser beam to the inside of a chamber. The controller controls the laser device based on a burst signal in which a burst period and an idle period are repeated. In the burst period, an extreme ultraviolet light beam has to be generated. In the idle period, the generation of the extreme ultraviolet light beam has to be paused. When a size of a target substance detected at the target detector in the idle period is greater than a predetermined size, the controller may reduce an intensity of a laser beam entering the inside of the chamber from the laser device.