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CreatorOptics Germanium Windows

CreatorOptics Germanium Windows
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CreatorOptics Germanium Windows

Product catalog summary
Overview of Germanium Windows
Germanium is extensively used in lenses and windows for thermal imaging and FLIR applications due to its high index of refraction, approximately 4. It has a useful transmission range from 2 to 13 micrometers but is opaque in the visible spectrum. A notable property of Germanium is thermal runaway, where transmission decreases as temperature increases, thus it should be used below 100°C. Its Knoop Hardness of 780 makes it suitable for rugged IR applications, and its high density of 5.33 g/cm3 should be considered in weight-sensitive designs.
Specifications and Quality Grades
  • Diameter: Ranges from 3mm to 300mm, with customization available.
  • Thickness: Ranges from 0.2mm to 50mm, with customization available.
  • Diameter Tolerance: Precise: +/-0.05mm, Standard: +/-0.1mm.
  • Thickness Tolerance: Precise: +/-0.025mm, Standard: +/-0.05mm.
  • Edge: Fine ground for both grades.
  • Chamfer/Bevel: 0.25*45° with no chips for both grades.
  • Flatness: Precise: 1/8 lambda per inch @633nm, Standard: 1/2 lambda per inch @633nm.
  • Parallelism: Precise: 30 arc sec, Standard: 3 arc min.
  • Surface Quality: Precise: 20/10, Standard: 60/40.
  • Clear Aperture: Greater than 90% for both grades.
  • Coating: Anti-reflection coating available at 3~5 microns and 8~12 microns, with DLC and customization options.
Additional Information
The document also mentions the transmission characteristics of a 10mm thick Germanium window and the availability of AR coatings for these windows, provided by Nanjing Creator Optics Co., Ltd.
See more

Catalog excerpts

CreatorOptics Germanium Windows-1

Germanium is used widely for lenses and windows in thermal imaging and FLIR applications. Its high index of refraction (about 4) makes it of particular interest. Useful transmission range of Germanium windows is from 2 to 13mkm. Germanium is opaque in the visible. Germanium has the property of thermal runaway, meaning that the transmission decreases as temperature increases. As such, Germanium window should be used at temperatures below 100°C. The Knoop Hardness of Germanium (780) is approximately twice that of MgF2, making it ideal for IR applications requiring rugged optics. Germanium’s high density (5.33 g/cmA3) should be considered when designing for weight-sensitive systems. AR Coating for Germanium Window

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