Material Guide
Germanium (Ge)
High-index IR material optimized for long-wave infrared imaging applications.
Material Introduction
Germanium is a classic LWIR optic material used in thermal cameras and harsh-environment sensing systems. It offers high refractive index and stable transmission in the 8 - 14 um band.
Optical Performance
| Metric | Typical Value |
|---|---|
| Transmission Range | 2 - 14 um |
| Refractive Index (10.6 um) | ~4.00 |
| Density | ~5.33 g/cm3 |
Applications
- Thermal imaging lenses
- IR objective systems
- Defense and surveillance payloads
Comparison Notes
Compared with ZnSe and Si, Ge has a significantly higher index and often requires careful anti-reflection coating design to control Fresnel losses.
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