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Germanium is widely used in far  infrared wavelength, it is transparent from 2 micron to 17 micron. Germanium also has higher refractive index about 4 at 10.6 micron. Germanium is very popular in FLIR and imaging applications.
Germanium 

Transmission Range: 2000nm~14000nm

Thermal Expansion Coefficient: 5.5x10-6/K

Density: 5.33g/cm3

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