Robust spin-on-glass ultrathin smoothing coatings allowing low-cost diamond-turned optics to be used in the extreme-ultraviolet and soft-x-ray regimes. Aluminum and copper optics (top, left and right, respectively) before smoothing and (center, left and right, respectively) after smoothing. (Bottom) Same atomic force microscope image as in center left but rescaled to accentuate the surface features. [See Salmassi et al. for details.]
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