title: Refractive index measurements of ten germanium samples.
abstract: The refractive index of germanium was measured for ten samples, covering the various crystal types, over the 8-14-microm wavelength range. Samples were obtained from several suppliers, and differences between samples in the index values reported were not significant compared with the estimated index uncertainties of +/-0.0003. Three samples were examined at two laboratories to act as a check on the absolute values obtained. A temperature coefficient index of 0.00040 degrees C(-1) was obtained for the 20-25-C range.
authors.affiliation: UK National Physical Laboratory, UK.
authors.forename: R P
authors.initials: RP
authors.lastname: Edwin
authors.forename: M T
authors.initials: MT
authors.lastname: Dudermel
authors.forename: M
authors.initials: M
authors.lastname: Lamare