Refractive index of garnet films containing Ca and Ge

Abstract

Refractive‐index–vs–wavelength data are reported over a wavelength range of 0.56 to 0.97 μ for several garnets containing Ca²⁺ and Ge⁴⁺ and various compositions of rare‐earth ions. The experimental data were fitted to a two‐term Sellmeier expression and a linear relation between index of refraction and number of Fe³⁺ ions was found for garnet composition with small rare‐earth content.