The optical constants of Se and CdTe have been measured in the far ir from 10 cm-1 to 100 cm-1 using Fourier transform spectroscopy. An oscillator model has been fit to the available data for both materials over the entire ir range from 10 cm-1 to 10,000 cm-1. Several three-phonon absorption peaks have been observed and identified in the absorption spectra of Se. The linear optical properties of these important ir materials have been summarized throughout the ir region.
Edward J. Danielewicz and Paul D. Coleman, "Far Infrared Optical Properties of Selenium and Cadmium Telluride," Appl. Opt. 13, 1164-1170 (1974)