Infrared measurement of the optical constants of the low melting temperature glass system of 30% arsenic — 34% sulfur — 36% thallium

Abstract

The low melting temperature, heavy metal sulfide glass system of arsenic, sulfur, and thallium has proven to be optically clear from 1 to 23 μ in wavelength. The optical constants, consisting of absorption coefficient, reflection coefficient, extinction coefficient, and refractive index, have been determined from 2 to 23 μ in wavelength. The reflection coefficient was calculated from a plot of transmission measurements as a function of sample thickness, extrapolated to zero thickness. In turn, this data, through the application of the Kramers-Kronig relationship, has yielded both the real and imaginary portions of the refractive index. As a result of the low working temperature of this composition glass, the possibility exists of manufacturing lenses and domes by molding between Teflon dies and other materials.