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Germanium (Ge crystal) windows

Germanium (Ge crystal) is a synthetic material, with melting point 937 C. It`s single crystal, which is growing by Czohralski method. Germanium belongs to the cubic crystal class m3m. Germanium crystals have a very high refractive index. Germanium crystals are very good known as semiconducting material. The first transistor was obtained with Germanium.

Optical Germanium crystals have a transmission in 2 – 22 microns range.

Application: solid state electronics, infrared optics, gamma radiation detectors and other.

Germanium windows specifications

Standard precision Germanium windows
Diameter+/-0.1mm
Thickness+/-0.05mm
Surface quality80/50
Flatnesslambda/2 @633nm per inch
Parallelism3 arc min
Clear Aperture>85%

High precision Germanium crystal
Diameter+/-0.05mm
Thickness+/-0.025mm
Surface quality40/20
Flatnesslambda/8 @633nm per inch
Parallelism30 arc sec
Clear Aperture>85%