Refractive index database

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Optical constants of GeO2 (Germanium dioxide, Germania)
Fleming 1984: Fused germania; n 0.36–4.3 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]



J. W. Fleming. Dispersion in GeO2-SiO2 glasses, Appl. Opt. 23, 4486-4493 (1984)


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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