The refractive index of natural Type IIa diamond is reported for the spectral region 2.5-25 µm. The data have been fitted to a Herzberger-type dispersion formula with a quality of fit of a few places in the fifth decimal place. The resultant index uncertainty is about 10-3.
© 1981 Optical Society of America
David F. Edwards and Ellen Ochoa, "Infrared refractive index of diamond," J. Opt. Soc. Am. 71, 607-608 (1981)