Infrared Germanium Window
.Infrared Germanium Window
Introduction:
Germanium Windows and Lenses are widely used in infrared devices, γ radiation detectors, because metal germanium can pass through 2 ~ 15 micron infrared, and can be polished as easy as glass, it also can effectively resist the corrosion of the atmospheric environment, so Monocrystal Germanium material can be used as infrared germanium window(ge window), prism, infrared optical lens. As an infrared optical material, germanium has the advantages of high infrared refractive index, wide infrared transmission range, small absorption coefficient, low dispersion rate, easy processing, flash and corrosion, etc.
In general situation, the main use frequency band of infrared germanium window is 8~12μm, the transmittance of uncoated germanium is only around 50%, but through the coating can greatly improve its transmittance and play a certain protective role, we provide DLC+AR, double-sided AR coating.
Crystal Structure: Face-centered cubic unit cells
Chemical Composition: Ge
Common Purity: 99.999%
Density: 5.35g/cm³
Moh's Hardness: 6~6.5
Knoop Hardness: 780kg/mm²
Shear Modulus: 67Gpa
Young Modulus: 100Gpa(14x10^6 psi)
Tensile Strength: 135Mpa
Poisson's Ratio: 0.27
Melting Point: 937.4℃
Boiling Point: 2830℃
Specific: 0.31J/G/℃
Thermal Expansion: 6x10^-6/℃@20℃
Acids And Alkalis Attack: Acid and alkali corrosion resistance, it does not react with dilute acid and dilute alkali, but can be dissolved in concentrated sulfuric acid or concentrated alkali when heated, germanium is also easy to react with nitric acid and aqua regia and other strong oxidizing acids
Solubility: Insoluble in water.
Refractive Index: 4.003
Infrared: MIR 2μm~10μm>50%
