This kind of BK7 Windows is made from SCHOTT N-BK7 Glass, which has transparent range from 330-2100nm.

Fused Silica Window is made from the material of fused silica. Fused Silica is a superior optical material possesses excellent optical, chemical and physical properties which is formed by chemical combination of silicon and oxygen.

This kind of windows is made from Custom-made material CaF2.

Silicon (Si) is grown by Czochralski pulling techniques (CZ) and contains some oxygen that causes an absorption band at 9 microns. To avoid this, material can be prepared by a Float-Zone (FZ) process.

ZnS is grown by chemical vapor deposition (CVD) method, for windows,domes and lenses for thermal-imaging system.

ZnSe (Zinc Selenide) is the most popular material for infrared applications. It can transmit from 0.6 μm to 20 μm.

Sapphire is a superior optical material possesses excellent optical, chemical and physical properties.