Custom Germanium (Ge) Plano Convex Lens with AR coating for Thermal Camera Sensor

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Specifications

Material: Ge
Diameter: 25 mm
Focal Length: 100 mm
Edge Thickness, Te: 3 mm
Lens Type: Plano-Convex
Surface Quality: 60-40, 40-20, or better
Surface Accuracy: λ/2, λ/4 or better
Coating: AR+DLC or Customer Request
Diameter Tolerance: +0/-0.1mm
Thickness Tolerance: ±0.1mm
Bevel: <0.35mm

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Features

  • High Refractive Index – Germanium has a high refractive index (~4.0 at 10.6 µm), making it suitable for infrared applications.
  • Infrared Transparency – It is highly transparent in the 2–14 µm wavelength range, ideal for thermal imaging and IR optics.
  • Low Dispersion – Germanium exhibits minimal chromatic aberration in the infrared spectrum due to its low dispersion.
  • High Density – With a density of ~5.33 g/cm³, it is relatively heavy compared to other optical materials.
  • Temperature Sensitivity – Its refractive index changes significantly with temperature, affecting optical performance in varying environments.
  • Durability and Hardness – Germanium is mechanically strong and resistant to scratches, making it suitable for rugged applications.
  • Absorption in Visible Spectrum – It is opaque to visible light, limiting its use to infrared applications.
  • AR Coating Compatibility – To reduce surface reflections, anti-reflective coatings like DLC or BBAR are commonly applied.

Applications

  • Thermal Imaging Systems – Used in infrared cameras and thermal imaging devices for defense, surveillance, and industrial applications.
  • Infrared Spectroscopy – Employed in IR spectrometers for chemical analysis and material identification.
  • CO2 Laser Optics – Used in 10.6 µm CO₂ laser systems for cutting, welding, and engraving applications.
  • Night Vision Devices – Integrated into night vision and IR detection systems for military and security purposes.
  • Medical Imaging – Applied in thermal diagnostic tools for detecting temperature variations in medical examinations.
  • Environmental Monitoring – Utilized in gas detection and remote sensing systems to analyze atmospheric conditions.
  • Aerospace and Defense – Incorporated into targeting, guidance, and surveillance systems in military and aerospace applications.
  • Hyperspectral Imaging – Used in IR hyperspectral cameras for geological mapping, agriculture, and food safety analysis.