Infrared materials include zinc selenide, zinc sulfide, barium fluoride, calcium fluoride etc.

Chemically vapor-deposited CVD Zinc Selenide® is the material of choice for use as optical components in high-powered CO2 lasers due to its low bulk absorption at 10.6 µm. Its index of refraction homogeneity and uniformity offers excellent optical performance for use as protective windows or optical elements in high-resolution forward-looking (FLIR) thermal imaging equipment.

CVD Ceramics' chemically vapor deposited CVD Zinc Sulfide is the low cost alternative for infrared windows, domes and optical elements.
With a fracture strength double that of zinc selenide and high hardness.
 

Hellma Materials CaF2 has been utilized as an optical key material in microlithography for semiconductor production for many years.
CaF2 is established as an industry standard material for excimer laser optics in projection and illumination optics.
The unique optical properties of CaF2 enable a variety of advanced applications.

Hellma Materials BaF2 features an excellent transmittance in the VIS and IR spectral ranges up to 12µm.
This allows the usage of BaF2 as broadband optical material in the VIS and IR dual-channel systems for visible and thermal imaging.
BaF2 has a lower refractive index than many other optical materials. This reduces transmission losses caused by Fresnel-reflection.

Germanium compounds and products are created during the various stages of the production flowsheet from raw materials to semiconductor substrate. Starting with Germanium concentrate chlorinated and purified into GeCl4 , GeCl4 hydrolized to GeO2 and GeO2 reduced to Ge bars. The Ge crystals are grown using Czochralski crystal pulling and further processed into either high purity crystals or Ge semiconductor wafers.