Germanium Wafer 40mm
Specifications
Material: Germanium
Dimension: Dia. 45.00mm
Thickness: 2.00mm
Tolerance : +/-0.10mm
Dimension: Dia. 45.00mm
Thickness: 2.00mm
Tolerance : +/-0.10mm
Germanium Windows and Ge Wafers
Our Germanium Windows are engineered with three distinct anti-reflection coating options to cater to a variety of applications:
- 3 – 5μm Coating: Optimized for mid-infrared uses.
- 3 – 12μm Coating: Ideal for broadband multispectral systems.
- 8 – 12μm Coating: Perfect for thermal imaging solutions.
Given its high refractive index, applying an anti-reflection coating is essential to ensure optimal light transmission. Germanium exhibits a phenomenon known as thermal runaway, where its transmission efficiency diminishes as temperatures rise. Therefore, these windows are best suited for operating environments below 100°C. Additionally, the material’s high density (5.33 g/cm³) should be factored into designs for weight-sensitive applications. With a Knoop Hardness of 780 kg/mm², roughly double that of magnesium fluoride, germanium is highly durable and well-suited for rugged infrared optical systems.
Product Showcase: 60mm Diameter, 5mm Thick Germanium Windows/Ge Wafers
Technical Specifications of Germanium
| Property | Value |
|---|---|
| Clear Aperture (%) | 90.00 |
| Dimensional Tolerance (mm) | +0.0 / -0.1 |
| Coefficient of Thermal Expansion (CTE) (10⁻⁶/°C) | 6.1 |
| Density (g/cm³) | 5.33 |
| Index of Refraction (nd) | 4.002 @ 11µm |
| Knoop Hardness (kg/mm²) | 780.00 |
| Parallelism (arcmin) | <1 |
| Poisson’s Ratio | 0.28 |
| Substrate Material | Germanium (Ge) |
| Surface Quality | 60-40 |
| Thickness Tolerance (mm) | ±0.1 |
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