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

Claim 9:
10. An electronic device manufacturing method, comprising:
generating extreme ultraviolet light using an extreme ultraviolet light generation apparatus;
adjusting a polarization direction of first laser light by a polarization direction adjustment unit based on an observation result of a distribution of a secondary target; and
emitting the extreme ultraviolet light to an exposure apparatus and exposing a photosensitive substrate to the extreme ultraviolet light in the exposure apparatus to manufacture an electronic device,
the extreme ultraviolet light generation apparatus including:
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 the first laser light having the polarization direction deflected in one direction and second laser light to generate the 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 the extreme ultraviolet light by irradiating the secondary target with the second laser light;
the 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; and
the secondary target observation unit configured to observe the distribution of the secondary target,
wherein a linear polarization degree P of the first laser light defined as P={(Imax−Imin)/(Imax+Imin)}×100(%) is 90% or more, where Imax and Imin represent a maximum value and a minimum value, respectively, of light intensity obtained by causing laser light to be incident on a polarization prism and measuring the light intensity of emission light from the polarization prism with a rotation angle thereof changed by rotating the polarization prism about an optical path axis of the laser light.