Germanium (Ge) is the preferred lens and window material for high performance infrared imaging systems in the 8–12 um wavelength band.
Specifications
|
Parameters
|
Commercial grade
|
Precision grade
|
|
Substrate Material
|
N Type <111>, Resistivity 5 - 40 ohmcm
|
|
Diameter Tolerance
|
+0/-0.10mm
|
|
Thickness Tolerance
|
±0.10mm
|
|
Clear Aperture
|
>Central 90% of diameter
|
|
Surface Quality
|
60-40 S/D
|
40-20 S/D
|
|
Parallelism
|
3~5 arc min
|
1 arc min
|
|
Surface Flatness
|
1λ per 25mm
|
λ/4 per 25mm
|
|
Chamfer
|
0.15~0.35mm×45°
|
|
Coating
|
Uncoated, DLC , AR
|
Note for Ge Window:
(1). Please specify the material and resistivity
Custom-made Ge windows at any size are available.
Besides round, shape of quadrate, triangular, or other polygonal are available.
(2). Thickness from 1.0mm to 80.0 mm is available upon request.
(3). Better bevel is available upon request.
(4)Ge Windows with Anti-Reflective(AR), High-Reflective(HR), DHL coating are available.
