Abstract
The results of the precise measurement of the refractive index of stable germanium isotopes , , , and single crystals with high enrichment and a germanium single-crystal of natural isotopic composition with the Fourier-transform interference refractometry method from 1.94 to 20 μm with resolution and accuracy of to are shown. The content of 72 impurities measured by the mass spectrometric method was below wt. %. Oxygen and carbon concentrations measured by IR spectroscopy in all crystals are within . All germanium crystals have a hole conductivity with specific electric resistivity of . The coefficients of the generalized Cauchy dispersion function approximating the experimental refractive index values all over the measuring range are given. The transmission and Raman spectra are also given.
© 2019 Optical Society of America
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