Optical properties of hot-pressed B4C in the extreme ultraviolet

Hot-pressed B4C is found to have a high normal reflectance in the extreme-UV spectral region above 49 nm. This reflectance is comparable with or higher than chemical-vapor-deposited Sic in the spectral region from 49 to 92 nm. Reflectance measurements as a function of the angle of incidence yielded the optical constants of B4C in the spectral range 49-121.6 nm. (C) 2000 Optical Society of America.