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Germanium Windows

The infrared germanium window is processed through fine grinding, grinding, measuring, ultra-high-precision polishing and other processes. Under precise control of the machine tool and processing environment, ultra-high-precision correction polishing technology is used to polish the window surface to achieve an optical plane. Infrared infrared germanium window with surface shape accuracy ≤0.1 micron and surface roughness Ra≤0.01 micron.

germanium windows
germanium glass window

Specifications of Germanium Windows


Infrared germanium window product parameter table
projectIndicator requirements
1. MaterialSingle crystal germanium infrared material.
2. DiameterOD≤300mm OD±0.025 or according to customer requirements
3. Center thicknessT±0.01 or according to customer requirements
4. Effective focal lengthaccording to customers needs
5. Working distanceaccording to customers needs
6. Effective apertureED>80% aspheric area
7. CoatingAR or DLC coating R<0.5% @λnm
8. Surface shapeUltra-high precision Rt≤0.1μm, high precision Rt≤0.5μm, precision Rt≤1μm
9. Surface quality60-40, 40-20, 20-10, 10-5


Features of Germanium Windows

Features of Germanium Windows
  • One-stop customized production: Solar Valley processes various circular, D-shaped, square, trapezoidal and other structural infrared germanium windows according to customer requirements.

  • Material: Single crystal germanium infrared material, in the range of 2-12 μm, germanium is the most commonly used material for producing lenses and efficient infrared windows in imaging systems, and can serve as the substrate for lenses, windows and output coupling mirrors.

  • Lens properties: uniform light spot, clear projection, complete specifications, aerospace quality, used in night vision goggles, medical endoscopes, laser processing, infrared thermal imaging cameras, temperature recorders, infrared fundus cameras, satellite infrared telescopes, etc.

    Product indicator description:

    1. Maximum dimensions of circular infrared germanium window: OD≤φ300mm

    2. Maximum dimensions of square infrared germanium window: L×W ≤300×300mm

    3. Infrared germanium windows can reach the following accuracy levels according to customer requirements:

    Ultra-high precision grade: surface error <0.1μm, surface roughness <0.01μm

    High precision grade: Surface error <0.5μm, surface roughness <0.05μm Precision grade: Surface error <1μm, surface roughness <0.1μm


  • Surface defect grade: 60-40, 40-20, 20-10. Produced according to customer requirements.

  • Coating: Coating according to customer requirements.

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