The dispersion of the refractive index of Bi<sub>12</sub>GeO<sub>20</sub> in the range 1.2–5.0 µm at room temperature has been obtained. Data have been analyzed in terms of Ketteler, Sellmeier–Drude, Lorentz–Lorenz, and Herzberger dispersion formulas. It is found that a Herzberger formula completely describes data on <i>n</i>(λ) up to the visible region.
© 1983 Optical Society of America
E. Burattini, G. Cappuccio, M. Grandolfo, P. Vecchia, and Sh. M. Efendiev, "Near-infrared refractive index of bismuth germanium oxide (Bi12GeO20)," J. Opt. Soc. Am. 73, 495-497 (1983)