Patent ID: 9232621
Filing Date: 2016-01-05
CPC Classification: H05G

Claim Text:
1. An apparatus for energy beam position alignment, said apparatus being configured to be used with a light source device having a first energy beam radiation unit for emitting a first energy beam and a second energy beam radiation unit for emitting a second energy beam, said light source device being adapted to irradiate a material of extreme ultraviolet radiation with the first energy beam and to direct the second energy beam to or in the vicinity of a first position on the material, which is irradiated with the first energy beam, thereby exciting the material, producing plasma and extracting extreme ultraviolet light from the plasma, said apparatus configured to align a second position on the material, which is irradiated with the second energy beam, with the first position, said apparatus comprising: an optical unit configured to allow the first energy beam emitted from the first energy beam radiation unit to pass therethrough, and to reflect the second energy beam emitted from the second energy beam radiation unit and direct the second energy beam in a same direction as a travelling direction of the first energy beam; a movable mirror configured to reflect the second energy beam and guide the second energy beam toward the optical unit; a beam detecting unit configured to detect an incident position of an incident energy beam thereon; and a branching unit configured to be movable and receive the first energy beam which has passed the optical unit and the second energy beam which is reflected by the optical unit, said branching unit being configured to branch a first part of the received first energy beam, and guide said first part of the received first energy beams toward said first position, while passing a second part of the received first energy beam and guiding the second part of the received first energy toward the beam detecting unit, said branching unit being configured to branch a third part of the received second energy beam and guide said third part of the received second energy beam toward said second position while passing a fourth part of the received second energy beam and guiding the fourth part of the received second energy beam toward the beam detecting unit, said movable mirror being configured to be able to adjust an incident position of the second energy beam on the optical unit upon adjustment of a first angle of said movable mirror, said branching unit being configured to be able to adjust the first position of the first energy beam on the material and the second position of the second energy beam on the material upon adjustment of a second angle of said branching unit.