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Home > Products > Windows > Germanium (Ge) Windows

Germanium Optical Components, Germanium Windows

     ar-coated-germanium-window     ar-DLC-coated-germanium-window

     Germanium (Ge) monocrystal windows, used primarily for light in the IR region of wavelength from 2 to 20um, at which Ge monocrystal offers higher internal transmittance.

    Creator Optics can provides quality customized Germanium windows. All of these custom made Germanium windows are designed to be used in precision optical and Infrared laser systems. The optical transmission is high with little or no distortion of the transmitted beam. The circumference is ground and both edges are no-chips beveled. All parameters of germanium windows can be customized according to customer requirements for processing. The material is IR-grade germanium crystal. Available size are from diameter 3mm up to 300mm. With a variety of optical coatings, these windows are widely used in infrared detectors and infrared imaging systems.

     Creator Optics can also provides other customized germanium optical components. They can be made according to drawings or samples. These germanium optical components or germanium windows can be coated with a far infrared AR coating and DLC (Diamond Like Coating) coating.

Specifications of Germanium (Ge) Windows:

     germanium-window      germanium-window-DWG

Specifications/Grade Precision Standard
Diameter Dia3mm to 300mm, customized available
Thickness 0.2mm to 50mm , customized available
Diameter Tolerance +/-0.05mm +/-0.1mm
Thickness Tolerance +/-0.05mm +/-0.05mm
Edge fine ground fine ground
Chamfer/Bevel 0.25*45°(no-chips) 0.25*45°(no-chips)
Flatness 1/10 lambda per inch @10.6um 1 lambda per inch @633nm
Parallelism 30 arc sec 3 arc min
Surface Qulitity 60/40 60/40
Clear Aperture >85% >85%
Coating AR/AR coating at 3-5 and 8-12 microns, AR+DLC @ 7-14um, customized available
Material IR-Grade Germanium monocrystal (Ge) *

   * Detailed characteristics of Germanium (Ge) monocrystal.

Transimission Range 1.8 to 23 micron
Refractive Index 4.0026 @ 11um
Reflection Loss 53% @ 11um
Absorption Coefficient <0.027 cm-1 @ 10.6um
Reststrahlen Peak N/A
dn/dT 396 x 10-6 /°C
dn/du = 0 almost constant
Density 5.33 g/cc
Melting Point 936°C
Thermal Conductivity 58.61 W m-1 K-1 @ 293K
Thermal Expansion 6.1 x 10-6/°C @ 298K
Hardness Knoop 780
Specific Heat Capacity 310 J Kg-1 K-1
Dielectric Constant 16.6 @ 9.37GHz @300K
Youngs Modulus (E) 102.7 GPa
Shear Modulus (G) 67 GPa
Bulk Modulus (K) 77.2 GPa
Elastic Coefficients C11=129 C12=48.3 C44=67.5
Apparent Elastic Limit 89.6MPa (13,000 psi)
Poisson Ratio 0.28
Solubility insoluble in water
Molecular Weight 72.59
Class/Structure Cubic Diamond, Fd3m

* For more information or other materials and requests, please contact us.

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