Patent ID: 9651875
Date: 2017-05-16
CPC Classifications: G03F

Claim:
1. An illumination system, comprising: a polarization member comprising a polarization modifier connected to an actuator system configured to move the polarization modifier such that it does not intersect with a radiation beam, such that it fully intersects with the radiation beam, or such that it partially intersects with the radiation beam; an array of individually controllable reflective elements positioned to receive the at least partly polarized radiation beam after it has passed the polarization member; a focusing lens configured to receive the radiation beam from the array of individually controllable reflective elements and to output a converging radiation beam; and a polarization shaping element located in a pupil plane of the illumination system and configured to shape the polarization of the radiation beam from the focusing lens by changing polarization of at least part of the radiation beam such that the radiation beam from the polarization shaping element has a part of the radiation beam with a different polarization than another part of the radiation beam.