Refractive index database

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Optical constants of GeO2 (Germanium dioxide, Germania)
Nunley et al, 2016: n,k 0.188–2.48 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Conditions & Spec sheet

n_is_absolute: true
wavelength_is_vacuum: true


300 K


T. N. Nunley, N. S. Fernando, N. Samarasingha, J. M. Moya, C. M. Nelson, A. A. Medina, S. Zollner, Optical constants of germanium and thermally grown germanium dioxide from 0.5 to 6.6 eV via a multi-sample ellipsometry investigation, J. Vac. Sci. Technol. B 34, 061205 (2016) (See supplemental materials)


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Germanium dioxide, GeO2

Germanium dioxide (GeO2) is often encountered in crystalline forms, which are transparent in the ultraviolet and infrared regions of the spectrum. This material is important in optical applications like fiber optic systems, where it is used as a dopant to adjust the refractive index of silica fibers. The compound can exist in multiple polymorphs, including hexagonal and tetragonal forms, each with their own set of optical and mechanical properties. It's also a precursor for producing high-purity germanium for use in semiconductors.

Other names

  • Germanium(IV) oxide
  • Germania
  • Germanium oxide
  • Germanic oxide

External links