Ge

Used as transparent barriers for sending and receiving light between two phases under varying conditions in temperature pressure chemical composition cleanliness and phase. Germanium crystal windows u..

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Ge

Ge

Used as transparent barriers for sending and receiving light between two phases under varying conditions in temperature pressure chemical composition cleanliness and phase. Germanium crystal windows used primarily for light in the infrared region of wavelengths from 2 to 20μm at which Germanium crystal offers higher internal transmittance.

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)
4-50
Thermal conductivity (j/k .m .s)
58.61 @ 293K
Thremal expansion coefficients (1/°c)
6.1x10-6 @298K
Density (g /cm-3)
5.33
Knoop hardness (kg/mm2)
780
ABSORPTION COEFFICIENT
3x10-6 @ 10600nm
Note: UPT can provide different dimension window, mirror, wedge at present.

Capability

End-Faces Configuration
Flat 
Optical product type
Window, Prism, Wedge
Dimension Tolerance (mm)
+/-0.1 (General), +0.0/-0.02 (High Precision)
Clear Aperture
>80% (Small Size), >90% (Large Size)
Parallelism
3 min. (General), 20 sec. (High Precision)
Perpendicularity
15 min. (General), 5 min. (High Precision)
Flatness (per 25mm@633nm)
λ(General), λ/10 (High Precision)
Surface Quality
60/40 (General), 10/5 (High Precision)
Bevel (face width x 450)
<0.3mm
 

Detail Specifications:

TYPE
POLISHING AREA
THICK PLATE
≤5x5mm
5x5 - 8x8mm
8x8 - φ 38mm
PRISM
≤40x40mm
THIN PLATE
≤5x5mm
5x5 - 8x8mm
8x8 - ≤ φ 38mm