Patent ID: 7599112

Claim:
A multilayer-flim reflective mirror, comprising: a mirror substrate comprising a surface; a multilayer film on the surface of the mirror substrate, the multilayer film comprising multiple layer-pairs each comprising a respective layer of a first material and a respective layer of a second material to form a reflective surface having an area, the area including a region in which at least one of the layer-pairs has a non-uniform thickness distribution compared to layer-pairs outside the region, thereby forming a respective irregularity in a surface contour of the reflective surface in the region compared to outside the region; an intermediate-layer of Si or of a material comprising Si, the intermediate layer being situated on the reflective surface and having a first surface and a second surface, the first surface being situated substantially at a surface of a top-most layer of the second material of the multilayer film, the first surface of the intermediate-layer being substantially complementary to the irregularity in the surface contour in the region, and the second surface of the intermediate layer providing a surface contour of the reflective surface in the region that substantially continues the surface contour of the reflective surface outside the region; and a capping layer, having a substantially uniform thickness, on the second surface of the intermediate-layer.