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  ZnSe
Zinc selenide, a chemically vapor deposited material, is used in high-power CO2 laser systems because of its low absorption at 10.6¦Ìm. It is also a popular choice in systems operating at various bands within its wide transmission range. Products such as lenses, windows, beamsplitters, filters, and prisms are available in different sizes.
 
 
  ZnS
A chemically vapor deposited material Zns regularly has good imaging quality over the 8- to 12-¦Ìm band. It also transmits the 3- to 5-¦Ìm band, but with higher absorption and scatter. The material exhibits high strength and hardness, and good resistance to hostile environments. The Zinc sulfide is one kind of important IR material being applied to more and more fields. Products such as lenses, windows, domes, wedges and prisms etc. of different sizes are available.
 
 
  SI
Si is a semiconductor material commonly used in infrared optical systems operating in the near-IR and MW spectral band. Silicon has the lowest density among common infrared materials, making it ideal for systems with weight constraint. Products such as windows, lenses, prisms, filters and wedges in different sizes are available.
 
 
  GE
Germanium has the highest index of refraction among commonly used infrared transmitting materials .It is a very popular material for systems operating in the 3-to5-or 8 to 12-¦Ìm spectral region. Germanium has nearly the highest density of the infrared transmitting material and this should be taken into account when designing for weight-restricted systems. Germanium is subject to thermal runaway, which means that the hotter it gets, the more the absorption increases. Products such as lenses, windows, beamsplitters, filters, wedges etc. are available.
 
 
  Sapphire windows
Sapphire crystal is extremely hard and scratch resistant useful for the visible and IR spectrum. Optical sapphire is made to a random orientation or cut to a specified orientation. It has excellent thermal conductivity at low temperatures allowing single crystal sapphire to be used in many diverse fields requiring thermal conduction and heat radiation. Sapphire has high dielectric constant and is resistant to common chemical acids and alkaline. Optical sapphire has no colouration and with a selection of grades of sapphire transmission ranging from 170nm to 6 microns . Sapphire windows, lenses, prisms and domes in various shapes, sizes and forms i.e. squares, plates, rectangles and discs are available.