Germanium Lens Prisms Window
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
Optical Properties
Transmission Wavelength |
2000nm—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 |
Refractive index range(20℃)
Wavelength(nm) |
Refractive index(n) |
Wavelength(nm) |
Refractive index(n) |
2200 |
4.0879 |
8000 |
4.0057 |
3000 |
4.0451 |
9000 |
4.0040 |
3800 |
4.0267 |
10600 |
4.0028 |
5000 |
4.0160 |
11000 |
4.0025 |
6000 |
4.0107 |
12000 |
4.0021 |
7000 |
4.0079 |
13000 |
4.0018 |
Manufacture Specifications
Diameter |
3mm to 280mm |
Diameter Tol. |
+/-0.1 |
Surface Quality |
40-20 standard |
Surface Quality |
40/20 |
Flatness |
1/4 lambda |
Chamfer |
0.25mmx45degree |
Focal Length Tol. |
+/-1% |
Coating |
Customer design |
sales@sunday-optics.com Bess Zhang
Phone:+8615104452660 +8618744192450
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