The refractive indices of synthetic sapphire (Al2O3) were measured at selected wavelengths and the values of index range from 1.834 at 0.265 μ in the ultraviolet to 1.586 at 5.58 μ in the infrared. A three-term Sellmeier dispersion equation of the form
was fitted to the experimental data. Dispersive quantities were computed which estimate the optical performance to be expected from sapphire.
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