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Optical constants in the spectral range 1.5-5.5 eV are presented for the heavy rare-earth metals Gd, Th, and Dy. The samples are thin films prepared by vacuum evaporation at pressures below 10'-torr, and are studied in situ using a precision ellipsometric technique. The optical spectra are broadly similar but differ slightly in their temperature dependence. The optical data complement recent magneto-optic spectra, and the significance of their difference is discussed in terms of existingdoi:10.1364/josa.64.001332 fatcat:dxndg5rxvrg5xckn77tia5hhrm