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Germanium Crystal  

 

Germanium (Ge) is used widely for lenses and windows in thermal imaging and FLIR applications. Its high index of refraction makes it of particular interest. Useful transmission range of Germanium windows is from 2 to 12 μm. Germanium is opaque in the visible.

 

Germanium has the property of thermal runaway, meaning that the transmission decreases as temperature increases. As such, Ge window should be used at temperatures below 100°. The higher Knoop Hardness of Germanium (780) makes it ideal for IR applications requiring rugged optics. Germanium's high density (5.33g/cm3) should be considered when designing for weight-sensitive systems.

 

Material Properties:

Material Type

N or P

Resistivity (Ohm/cm)

5-40

Thermal conductivity (J/k .m .s)

58.61 @ 293K

Thermal Expansion Coefficients (1/°C)

6.1x10-6@298K

Density (g /cm-3)

5.33

Knoop Hardness (kg/mm2)

780

Absorption Coefficient

3x10-2@10600nm

 

PHOSCTECH can provide different dimension spherical Ge lens, Aspherical Ge lens ,Ge window,Ge mirror,Ge Rod and Ge wedge.

 

Capability:

Attribute

Commercial

High Precision

Typical Diameter φ(mm)

3, 6, 12.7, 25.4, 30, 38, 50.8, 60, 80, 160

Typical Thickness (mm)

0.6, 1, 2, 3, 5, 8, 10, 15, 20

Dimension Tolerance

± 0.1mm

± 0.02mm

Surface Quality

60-40 scratch and dig

10-5 scratch and dig

Flatness

λ/4

λ/10

Parallelism

20"

2"

Perpendicularity

15'

5'

Centration (arc min)

<3'

<1'

Note:   AR Coating and DLC coating are available upon request.
            Other sizes are available upon request.

   
 

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