Patent ID: 9025131
Filing Date: 2015-05-05
Classification: G03F

Abstract:
1. An optical beam deflecting element, comprising: first deflecting structures in a first region of the optical beam deflecting element, the first deflecting structures being configured to generate a bundle of first rays when a radiation beam is incident on the first deflecting structures, each of the first rays having a propagation direction corresponding to a ray angle within a first distribution of ray angles, the bundle of first rays encompasses the entire first distribution of ray angles, the first rays having intensities according to a first intensity distribution; and second deflecting structures in a second region of the optical beam deflecting element, the second region being laterally offset from the first region, the second deflecting structures being configured to generate a bundle of second rays when the radiation beam is incident on the second deflecting structures, each of the second rays having a propagation direction corresponding to a ray angle within a second distribution of ray angles, the bundle of second rays encompasses the entire second distribution of ray angles, the second rays having intensities according to a second intensity distribution which is different from the first intensity distribution, wherein the first distribution of ray angles is identical to the second distribution of ray angles.