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  • Germanium Window

  • Germanium Window

  • Germanium Window

Germanium Window

Ge has high refractive index, The transmission wavelength for Monocrystal Germanium is 2-12um, it is a common infrared crystal which is widely used for infrared image system and infrared spectrograph systems. Ge has a small absorbency at 10.6um. It is a good material for CO2 lens and windows.

Product Details

Ge has high refractive index, The transmission wavelength for Monocrystal Germanium is 2-12um, it is a common infrared crystal which is widely used for infrared image system and infrared spectrograph systems. Ge has a small absorbency at 10.6um. It is a good material for CO2 lens and windows. Three kinds AR Coating are available: 3-5 μm for mid-infrared applications. 3-12 μm for broadband multispectral applications, and 8-12 μm for thermal imaging applications.Germanium optical materials are also suitable to be used with wavelength of 8-12μm.Germanium is highly affected by temperature, and the transmittance decreases with increasing temperature; therefore, they can only be used below 100C.The density of germanium (5.33 g/cm3) should be taken into account when designing systems with strict weight requirements.Germanium is mainly used in thermal imaging systems and forward looking infrared (FLIR).Germanium has a Knoop hardness of 780, about twice that of magnesium fluoride, making it suitable for IR applications in variable optics.


 Uncoated Ge

Germanium Window


Optical Properties

Transmission Wavelength2000nm—12000nm
Absorptivity (1/cm)1.3*10-3 @ 3800nm 3*10-2 @ 10600nm
Thermo-optical coeffecient, dn/dT (1/k)4.08*10-4 @10600nm
Electrical resistivity5-40 Ω.cm 1-5Ω.cm >50Ω.cm


Refractive index range(20℃)

Wavelength(nm)Refractive index(n)Wavelength(nm)Refractive index(n)
22004.087980004.0057
30004.045190004.0040
38004.0267106004.0028
50004.0160110004.0025
60004.0107120004.0021
70004.0079130004.0018


Manufacture Specifications

Diameter2-450mm
Diameter Tol.+/-0.1
Surface Quality60-40 standard
Flatness1/4 lambda
Chamfer0.25mmx45degree
Focal Length Tol.+/-1%
Coating2-14um
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