Patent 11605477 was granted and assigned to Taiwan Semiconductor Manufacturing Company on March, 2023 by the United States Patent and Trademark Office.
An extreme ultra violet (EUV) light source apparatus includes a metal droplet generator, a collector mirror, an excitation laser inlet port for receiving an excitation laser, a first mirror configured to reflect the excitation laser that passes through a zone of excitation, and a second mirror configured to reflect the excitation laser reflected by the first mirror.