Patent ID: 11924954
Assignee: GIGAPHOTON INC.
Field: Medical technology (Instruments)
Classification: CPC H  G | IPC G  H

Claim 15:
16. An extreme ultraviolet light generation apparatus comprising:
a chamber;
a target supply unit configured to supply a target to a plasma generation region in the chamber;
a laser system configured to emit first laser light having a polarization direction deflected in one direction and second laser light to generate a secondary target that is the target diffused by irradiating the target with the first laser light from a direction perpendicular to a travel axis of the target and to generate extreme ultraviolet light by irradiating the secondary target with the second laser light;
a polarization direction adjustment unit arranged on an optical path of the first laser light and configured to adjust the polarization direction of the first laser light;
an extreme ultraviolet light observation unit configured to observe energy of the extreme ultraviolet light; and
a processor configured to control the polarization direction adjustment unit based on an observation result of the extreme ultraviolet light observation unit,
wherein the polarization direction adjustment unit is controlled so that the polarization direction of the first laser light to be radiated to the target has an angle in a range of 45° or more and 118° or less with respect to the travel axis of the target.