Avantier designs and manufactures passive athermal Germanium LWIR lenses optimized for stable thermal imaging in demanding environments. Operating in the 8–12 µm band, these specialized lenses are part of our broader LWIR lens portfolio and build on our extensive experience in Germanium lenses for thermal imaging. Our optical assemblies maintain focus stability from -40°C to +80°C without active refocusing mechanisms, making them well suited to rugged defense and industrial systems.

Key Specs for Passive Athermal Germanium LWIR Lenses

• Wavelength: 8–12 µm long?wave infrared
• Material: Germanium, passive athermal design
• Thermal range: -40 °C to +80 °C focus stability
• Use cases: Defense, surveillance, UAV, rugged industrial monitoring
  
  

Why Germanium for LWIR Systems?

Germanium remains a leading material for rugged LWIR optics due to:

• High refractive index for compact optical designs
• Knoop hardness: 780–900 kg/mm²
• Excellent chemical resistance
• Strong transmission across the 8–12 µm spectrum
  
  

Application Ready Engineering & Manufacturing Options

Avantier's Germanium LWIR lenses are optimized for 10–12 µm uncooled detector systems and compatible with 12 µm and 17 µm pixel pitch arrays. Vacuum-compatible, low-outgassing materials and advanced DLC and BBAR coating options make them suited for demanding defense environments.

Stock capabilities include manual, fixed, and motorized focus options, with focal lengths from 3.8 mm to 250 mm and back working distances (BWD) from 13.3 mm to 61.26 mm. Mount options include M34x0.5, M34x0.75, M45x1, C-mount, and flange configurations. Check Stock IR Lenses

Custom development covers detector-specific optimization, passive athermal integration, optical design file collaboration, and support from prototype through volume production.