 Germanium dioxide (germania) GeO2 |
| Germanium dioxide's refractive index and optical dispersion properties make it useful as an optical material for wide-angle
lenses and in optical microscope objective lenses. It is transparent in infrared.
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| Mixture of silicon dioxide and germanium dioxide ("silica-germania") is used as an optical material for optical fibres and optical waveguides. Controlling the ratio
of the elements allows precise control of refractive index. Silica-germania glasses have lower viscosity and higher refractive
index than pure silica.
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