Scattering from normal-incidence EUV optics

Abstract
Measurements of nonspecular EUV scattering from Mo/Si multilayer coated mirrors have been performed. The surface power spectral density is deduced from the angular scattering distribution and in all cases is found to be in excellent agreement with surface profile measurements, by both optical and atomic force microscopy. It is demonstrated that the effects of scatter on the EUV imaging performance of a single normal incidence optic are accurately predicted from surface profile measurements.