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GE 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. The useful transmission range of Germanium windows is from 2 to 12 μ m. 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. Germaniumundefineds high density (5.33g/cm3) should be considered when designing for weight-sensitive systems.

Material Properties:

 Material Type  N or P
 Resistivity (Ohm/cm)  4-50
 Thermal Conductivity (J/k.m.s)
 58.61 @ 293K
 Thermal Expansion Coefficients (1/oC)
 6.1x10-6 @298K
 Density (g/cm3)
 5.33
 Knoop Hardness (kg/nm2)
 780
 Absorption Coefficient
 3x10-2 @ 10600nm


Casix can provide different dimension window, mirror, wedge at present.

Capability:

AttributeCommercialHigh Precision
End-Faces ConfigurationFlat
Dimension Tolerance± 0.1mm± 0.01mm
Surface Quality40-20 scratch and dig10-5 scratch and dig
Flatnessλ/4λ/10
Parallelism20"2"
Perpendicularity15'5'

 


Detail Specifications:

TypePolishing AreaRoughness


Thick Plate

≤5x5mm1nm
5x5 - 8x8mm1nm
8x8 - Φ 38mm1nm


Thin Plate

≤5x5mm1nm
5x5 - 8x8mm1nm
8x8 - ≤ Φ 38mm1nm


Product Catalog Download

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