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.