The near millimetre wavelength optical constants of some potential window materials at elevated temperatures

Abstract The results of dispersive Fourier transform spectroscopic measurements of the temperature dependence of the near millimetre wavelength optical constants of some potential window and window coating materials for fusion plasma diagnostics and high power applications, are discussed. The measurements covered spectral regions between 4 and 18 cm −1 (120 to 540 GHz), with specimen temperatures between 20 and 1000°C.