Germanium – Ge
lenses, windows, mirrors, filters and prisms
Germanium lenses have a high refractive index making it essential to add anti-reflection coating to improve its transmission.
Germanium windows and lenses are highly sensitive to temperatures above 70°C when it will become opaque. Germanium has a rugged appearance and is especially durable making it suitable for external Infrared applications.
Our Germanium lenses are most commonly used to focus infrared light and can be used for camera lenses.
| Transmission Range | 1.8 – 23.0 µ |
| Crystal Structure | Diamond |
| Cleavage Plane | 111 |
| Colour | Metalic lustre |
| Density | 5.327 (25°) |
| Melting Point (°) | 942 |
| Reflection Loss | 52.9% (10µ) for 2 surfaces |
| Solubility index | Insoluble |
| Hardness (Knoop) | 692 |
| Thermal Conductivity (cal/cm sec°C) | 0.14 (20°C) |
| Thermal Expansion coefficient (/°C) | 5.5×10-6(25°C) |
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