| 摘要 |
The invention relates to an optical system, in particular an illumination device or a projection objective of a microlithographic projection exposure apparatus, comprising a polarization compensator (100, 200, 300, 400, 800, 900), which has at least one polarization-modifying partial element (110-140, 210-240, 310-340, 410-440, 810-840, 910-940), and a manipulator (150, 250, 722, 851-854, 951a-954a, 951b-954b), by means of which the position of the at least one partial element can be altered, wherein, in the optical system, at least one operating mode (501-504) can be set in which the intensity, over a region which belongs to a plane perpendicular to the optical axis (OA) and which can be illuminated with light from said light source, does not exceed 20% of the maximum intensity in said plane, and wherein the manipulator (150, 250, 722, 851-854, 951a-954a, 951b-954b) is arranged in said region. |
