IR Ge Germanium Plano Convex Lens 8mm

FOB Price
USD $3.00 / Piece
Place Of Origin
CHINA
Minimum Order
1
Packaging
10pcs
Delivery
15 Days
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.

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


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
Electrical resistivity 5-40 Ω.cm 1-5Ω.cm >50Ω.cm


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 2-450mm
Diameter Tol. +/-0.1
Surface Quality 60-40 standard
Flatness 1/4 lambda
Chamfer 0.25mmx45degree
Focal Length Tol. +/-1%
Coating 2-14um
  • Country: China (Mainland)
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  • Founded Year:2010
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  • Contact:Bess Zhang
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