Patent ID: 9167679
Filing Date: 2015-10-20
Classification: G21K,H05G

Abstract:
1. A method of aligning an irradiating amplified light beam relative to a target material, the method comprising: accessing first, second, and third measurements of a reflected amplified light beam, the first measurement obtained from a first sensor, the second and third measurements obtained from a second sensor having a lower acquisition rate than the first sensor, and the reflected amplified light beam being a reflection of the irradiating amplified light beam from a target material, the target material comprising a material that emits extreme ultraviolet (EUV) light when converted to a plasma; determining, based on the first measurement, a first location of the amplified light beam relative to the target material in a direction that is perpendicular to the direction of propagation of the irradiating amplified light beam; determining, based on the second measurement, a second location of the amplified light beam relative to the target material in a direction that is perpendicular to the direction of propagation of the irradiating amplified light beam; determining, based on the third measurement, a location of a focal plane of the amplified light beam relative to the target material in a direction that is parallel to the direction of propagation of the irradiating amplified light beam; and repositioning the irradiating amplified light beam to relative to the target material based on one or more of the first location, the second location, or the location of the focal plane to align the irradiating amplified light beam relative to the target material.