Synthetic sapphire, Extraordinary ray (e), 20 °C
1) I. H. Malitson and M. J. Dodge. Refractive Index and Birefringence of Synthetic Sapphire, J. Opt. Soc. Am. 62, 1405 (1972)
2) M. J. Dodge, "Refractive Index" in Handbook of Laser Science and Technology, Volume IV, Optical Materials: Part 2, CRC Press, Boca Raton, 1986, p. 30
* Ref. 1 is a talk abstract in a conference program; Ref. 2 provides Sellmeier equation
Aluminium sesquioxide, Al2O3
Alumina, Aluminium oxide, Aloxite, Aluminium oxide (α), Aluminium(III) oxide, Dialuminium trioxide.
Mineral name: Corundum.
Gemstones: Sapphire, Ruby.