Patent ID: 6833223
Filing Date: 2004-12-21
Classification: B82Y,G03F,G21K

Abstract:
A multilayer-film mirror, comprising:a mirror substrate; and a multilayer film on a surface of the mirror substrate, the multilayer film being configured so as to render the surface reflective to one or more selected wavelengths of incident X-ray light, the multilayer film being formed of alternating superposed layers of a first and a second material arranged as multiple layer pairs superposed on the surface, the first material having a relatively large difference between its refractive index for X-ray light and its refractive index in a vacuum, and the second material having a relatively small difference between its refractive index for X-ray light and its refractive index in a vacuum, wherein (a) each layer of the first material in the multilayer film has a respective thickness, and (b) in at least one of the layer pairs, a ratio (&Ggr;) of the thickness of the respective layer of the first material to a thickness of the layer pair has a variable distribution over at least a portion of the surface.