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Silicon windows and Germanium windows

Silicon windows and Germanium windows are the most commonly used Infrared(IR) windows. The best working wavelength of Silicon windows is 3-5um, and the best working wavelength of Germanium windows is 2-14um. It is one of the best substrate materials
Silicon windows and Germanium windows are the most commonly used Infrared(IR) windows. The best working wavelength of Silicon windows is 3-5um, and the best working wavelength of Germanium windows is 2-14um. It is one of the best substrate materials for filters.

Germanium has good thermal conductivity and a high epinuclear hardness and strength, it is often used in Infrared systems that require higher strength. Due to its high refractive index, an Antireflection(AR) coating is usually required to improve the transparency of Germanium windows, its commonly used wave bands are: 3~12um or 8~12um. The transmission properties of Germanium are extremely sensitive to temperature changes. The higher the temperature and the lower the transmittance. The best Operating temperature of Ge window is <100 ℃.

Germanium windows

Germanium windows have higher hardness than Magnesium fluoride(MgF2) windows and can be used in the field of optoelectronics, Infrared thermal imaging cameras, Infrared laser systems, Infrared optical instruments, Infrared optics, etc.


We can customize different size and thickness of Germanium(Ge) optical window upon requirements, such as Germanium(Ge) round wafer, Square substrate and Cylinder, or Punch holes and other shapes.

Germanium(Ge) optical windows

Material Standard Size Surface quality
Germanium(Ge) window φ10.0mm x 1.0mm Polishing:             Double side optical polished or Epi-polished
φ25mm x 1.0mm Roughness:          Ra<0.5nm, Ra<1nm or Ra<5nm
φ25.4mm x 3.0mm Size Tolerance:          +/-0.1mm
φ25.4mm x 5.0mm Thickness Tolerance: +/-0.1mm or +/-0.05mm
φ50mm x 1.0mm Parallelism:           1 minute, 30 seconds, 5 seconds or higher
φ50.8mm x 3.0mm Surface Finish:      60-40, 40-20, 20-10 or others
12.7 x 12.7 x 3.0mm Surface Figure:      1/2λ, 1/4λ or higher
25.4 x 25.4 x 3.0mm Chamfer:                0.25mm × 45°
Or others Coating:                 Upon requirements
For more information, please feel free to send us an Online Inquiry or Email us.

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