Patent ID: 10001631

Abstract:
A film element of an EUV-transmitting wavefront correction device is arranged in a beam path and includes a first layer of first layer material having a first complex refractive index n1=(1−δ1)+iß1, with a first optical layer thickness, which varies locally over the used region in accordance with a first layer thickness profile, and a second layer of second layer material having a second complex refractive index n2=(1−δ2)+iß2, with a second optical layer thickness, which varies locally over the used region in accordance with a second layer thickness profile. The first and second layer thickness profiles differ. The deviation δ1 of the real part of the first refractive index from 1 is large relative to the absorption coefficient ß1 of the first layer material and the deviation δ2 of the real part of the second refractive index from 1 is small relative to the absorption coefficient ß2 of the second layer material.