Journal
APPLIED OPTICS
Volume 45, Issue 20, Pages 4833-4842Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.45.004833
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We have used polished stainless steel as a mirror substrate to provide focusing of soft x rays in grazing-incidence reflection. The critical issue of the quality of the steel surface, polished and coated with gold, is discussed in detail. A comparison is made to a polished, gold-coated, electroless nickel surface, which provides a smoother finish. We used the surface height distributions, measured with an interferometric microscope and complemented by atomic-force microscope measurements, to compute power spectral densities and then to evaluate the surface roughness. The effects of roughness in reducing the specular reflectivity were verified by soft-x-ray measurements. (C) 2006 Optical Society of America.
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