Passive Athermal Germanium LWIR Lenses for Defense & Harsh Environments
Avantier designs and manufactures passive athermal Germanium LWIR lenses optimized for stable thermal imaging in demanding environments. Operating in the 8–12 µm band, our optical assemblies maintain focus stability from -40°C to +80°C without active refocusing mechanisms.
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
Passive Athermal Stability
Thermal drift can degrade LWIR imaging performance. Avantier applies precision opto-mechanical co-design to balance thermal expansion and refractive index variation, achieving passive focus stability across wide temperature gradients.
Our athermal Germanium LWIR lenses minimize defocus without heaters or motorized compensation, improving reliability and reducing system complexity.
👉 Read the Passive Athermal LWIR Case Study to see real-world performance across -30°C to +60°C deployments.
Defense-Ready Engineering
- Optimized for 10–12 µm uncooled detector systems
- Compatible with 12 µm and 17 µm pixel pitch arrays
- Vacuum-compatible and low-outgassing materials
- Advanced DLC and BBAR coating options
Stock & Custom Options
Stock Capabilities
- Manual, fixed, and motorized focus
- 3.8 mm to 250 mm focal lengths
- BWD: 13.3 mm to 61.26 mm
- M34x0.5, M34x0.75, M45x1, C-mount, flange
Custom Development
- Detector-specific optimization
- Passive athermal integration
- Optical design file collaboration
- Prototype through volume production
Material Flexibility for Athermal LWIR Systems
While Germanium is widely used for ruggedized LWIR applications, Avantier also supports passive athermal designs using chalcogenide glass materials when weight reduction or molded aspheric performance is required.
Material selection is determined by environmental exposure, system size constraints, and thermal compensation requirements.
Request a Passive Athermal Germanium LWIR Lens
To accelerate evaluation, please include:
- Detector format & pixel pitch
- Operating temperature range
- Target focal length / F-number
- Environmental requirements
- Estimated annual volume
Contact Avantier to discuss your passive athermal Germanium LWIR lens requirements.
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