Germanium has the property of thermal runaway, meaning that the transmission decreases as temperature increases. As such, Ge window should be used at temperatures below 100°. The higher Knoop Hardness of Germanium (780) makes it ideal for IR applications requiring rugged optics. Germanium's high density (5.33g/cm3) should be considered when designing for weight-sensitive systems. 

Parameters

Material: Germanium

Diameter:+0/-0.10mm

Thickness: +/-0.1mm

Clear aperture: ＞80% of central diameter

EFL: +/- 1%

Centration: ＜ 3 arc minutes

Surface quality: 60-40 scratch and digs

Flatness: λ/4

Bevel : Protective bevel

Products