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| Place of Origin | CHINA |
| Brand Name | zmkj |
| Model Number | Ge-optical |
2inch 4inch 6inch N Type P type doped Germanium Single Crystals Wafers,
Germanium Single Crystals optical plates
Ge wafer / Ge window
Germanium (Ge) is the preferred lens and window material for high performance infrared imaging systems in the 8–12 um wavelength band. Its high refractive index makes Ge ideal for low power imaging systems because of minimum surface curvature. Chromatic aberration is small, often eliminating the need for correction.
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General Properties
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General Properties Structure
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Cubic, a = 5.6754 Å
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Density: 5.765 g/cm3
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Melting Point: 937.4 oC
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Thermal Conductivity: 640
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Crystal Growth Technology
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Czochralski
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Doping available
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Undoped
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Sb Doping
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Doping In or Ga
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Conductive Type
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N
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P
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Resistivity, cm－1
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>35
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< 0.05
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0.05 - 0.1
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EPD
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< 4x10^3/cm2
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< 4x10^3/cm2
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< 4x10^3/cm2
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Crystal Grades and Application
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(please specify when you order) Electronic Grade
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Used for diodes and transistors
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Infrared Grade
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Used for IR optical window
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Cell Grade
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Used for substrates of solar cell
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Standard Specs of Ge Crystal and wafers
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Crystal Orientation
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<111>,<100> and <110> ± 0.5° or custom orientation
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Crystal boule as grown
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1" ~ 5" diameter x 200 mm Length
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Standard blank as cut
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1"x 0.5mm
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2"x0.6mm
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4"x0.7mm
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5"&6"x0.8mm
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Standard Polished wafer(One/two sides polished)
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1"x 0.30 mm
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2"x0.5mm
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4"x0.5mm
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5"&6"x0.6mm
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Germanium also is most widely used for lenses and windows in IR systems operating in the 2 um - 12 um range. Its transmission is very temperature sensitive, becoming opaque near 100°C. Environment does not cause problems because Germanium is inert, mechanically rugged, and fairly hard.
Germanium is a high index material that is used to manufacture Attenuated Total reflection (ATR) prisms for spectroscopy. Its refractive index is such that germanium makes an effective natural 50% beamsplitter without the need for coatings. It is also used extensively as a substrate for production of optical filters. Germanium covers the whole of the 8-14 micron thermal band and is used in lens systems for thermal imaging. It can be AR coated with diamond producing an extremely tough front optic.
Application as window, lens, beamsplitter, ATR prism or filter in spectrometers and in thermal imaging.
Specifications for Ge windows :
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Material: |
Ge |
| Dimension Tolerance | +0.0, -0.1mm |
| Thickness Tolerance: | ± 0.1mm |
| Surface quality: | 60/40 |
| Clear Aperture: | >85% |
| Flatness: | λper 25mm |
| Parallelism: | 3' |
| Bevel: | <0.25mm X 45° |
| Coating: | Upon requirement |
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Materials characteristics Item B270 CaF2 Ge MgF2 N-BK7 Sapphire Si UV Fused Sillca |
| Q:Why to choose ZMKJ? |
A. ZMKJ has a factory manufactuer offers custom varied high quality optical and semi wafers products.
B. A compelet set of trade serves timely.
C. Stable delivery,General produce time:7-20 days.
| Q:How to pay? |
100％ in advance before delivery by TT,paypal, Alipay. delivery company choose DHL,Fedex ,SF,EMS.
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