Optical constants of SiC mirrors produced by different methods for photons of 60-1000 eV

The optical constants of seven CVD‐SiC mirrors produced by different processes and a sintered SiC mirror have been measured in the soft x‐ray region by means of the reflectance method. Although they are different in the crystal structure, the optical constants of the CVD‐SiC mirrors are almost independent of the samples over the measured 200–1000 eV range. But the optical constants of the sintered SiC differ from those of the CVD‐SiC mirrors over the measured range of 60–1000 eV. The photon‐energy dependence of the optical constants of CVD‐SiC is represented in terms of power formulas above 300 eV.