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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.


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
TAGS: Achromatic Cylindrical Lens, Rod Lens, ge windows, germanium window
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