| 摘要 |
The present invention pertains to an optical unit which can be arranged in optical system of an illumination apparatus for illuminating a first surface with light from a light source, the optical unit comprising a light splitter to split an incident beam traveling in an incident light path, into a plurality of beams; a first spatial light modulator which can be arranged in an optical path of a first beam out of the plurality of beams and which forms a desired illuminant distribution at a pupil plane of the illumination apparatus; a second spatial light modulator which can be arranged in an optical path of a second beam out of the plurality of beams and which forms a desired illuminant distribution at the pupil plane of the illumination apparatus; and a light combiner to combine a beam having passed via the first spatial light modulator, with a beam having passed via the second spatial light modulator, and to direct a resultant beam to an exiting light path; wherein at least one spatial light modulator out of the first spatial light modulator and the second spatial light modulator includes a plurality of optical elements arranged two-dimensionally and controlled individually; wherein the incident light path on the light splitter side and the exiting light path on the light combiner side extend in the same direction; and, wherein the light splitter includes a polarization separating film. |
