Silicon Protective Windows for LWIR Imaging, a Durable, Cost-Effective Germanium Alternative
Germanium is typically the go-to material for long-wave infrared (LWIR) optics because of its high refractive index and low dispersion, but its high cost and sourcing difficulties limit its use in cost-sensitive or large-scale applications. Chalcogenide glass offers an alternative but lacks durability and mechanical strength.
SiLWIR™ Features:
- Diamond-Like Carbon (DLC)
- Oleophobic Coating
- BBAR Anti-Reflection (AR) coating on ‘both’ sides
SiLWIR™ Protective Windows can withstand harsh environments and temperatures up to 200° C, are suitable for weight-sensitive applications, and adhere to MIL-F-48616 and MIL-C-48497C standards for severe abrasion resistance. With a Knoop Hardness of 1150, they’re low density, robust, lightweight and less prone to breakage.
SiLWIR™ Specifications
- Cost-effective and readily available, compared to germanium
- Specifically designed for thermal LWIR applications
- DLC and BBAR coating (8-12µm) | peak transmission >80%
- Safe in high-temperature applications ~200° C
- 1150 Knoop Hardness – strong and durable
- Meets MIL-F-48616 and MIL-C-48497C standards
- Available in sizes up to 8” in diameter
- Available with VHB adhesive
SiLWIR™ Applications
- Thermography
- Military (DOD) applications
- Furnace inspection
- Night vision/Surveillance
- Mine detection
- Medical imaging
- Industrial process control
- Fire fighting