Patent ID: 7196841

Claim:
A lighting system, in particular for EUV lithography, comprising a projection objective for producing semiconductor elements for wavelengths ≦193 nm, a light source, an object plane, an exit pupil, a first optical element having first grid elements for producing optical channels and a second optical element having second grid elements, each optical channel which is formed by one of the first grid elements of the first optical element being assigned a grid element of the second optical element, it being possible for grid elements of the first optical element and of the second optical element to be configured in such a way or arranged in such a way that the result for each optical channel is a continuous beam course from the light source as far as the object plane, characterized in that the angles of the first grid elements of the first optical element can be adjusted in order to modify a tilt in order, by means of tilting the first grid elements, to implement a different assignment of the first grid elements of the first optical element to the second grid elements of the second optical element.