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Germanium Lens

The transmittance range of optical germanium material is 2-14um, and its refractive index is as high as 4. Germanium lens and germanium window are widely used in thermal imaging system.
Because germanium material has high refractive index, the surface reflectivity is very high (R>30%), so optical germanium elements usually need AR coating.



    





Germanium lenses specifications:


Standard precision

High-precision

Dimension Tolerance

φ5-250mm+0/-0.2

φ3-350mm+0/-0.2

Thickness Tolerance

1-50mm+/-0.1

1-50mm

Centration

3 arc minute

1 arc minute

Surface Quality

60/40

20/10

Power(fringe@633nm)

N<λ/2@633nm(in 25mm)

N<λ/10@633nm(in 25mm)

Clear Aperture

>90%

>95%

Chamfer

Protected <0.5mmx45deg

Protected <0.5mmx45deg





Germanium Coating

   Custom germanium windows ,lenses and prisms are available in any size and configuration. Anti-reflection coatings can be applied for 2-14µm or 8-12µm (BBAR coating or DLC/BBAR) depending on your custom application.


 

 





Germanium properties
Chemical Formula Ge
Crystal Form Poly or Single Crystal
Crystal Class Cubic
Resistivity, Ohm*cm 5-40
Lattice Constant, Å 5.66
Molecular Weight 72.60
Density, g/cm3 at 300 K 5.33
Dielectric Constant for 9.37 x 109 Hz at 300 K 16.6
Melting Temperature, K 1210
Thermal Conductivity, W/(m K) at 293 K 59
Thermal Expansion, 1/K at 298 K 6.1 x 10-6
Specific Heat, cal/(g K) at 273-373 K 0.074
Debye Temperature, K 370
Bandgap, eV 0.67
Solubility in water None
Knoop Hardness, kg/mm2 800
Mohs Hardness 6.3
Young's Modulus, GPa 102.66
Shear Modulus, GPa 67.04
Bulk Modulus, GPa 77.86
Poisson's Ratio 0.278




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