Diameter 60mm Thickness 5mm Germanium (Ge) Window
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/Ge Wafers
Germanium Windows are available with three anti-reflection coating options:
- 3 – 5μm: For mid-infrared applications.
- 3 – 12μm: For broadband multispectral applications.
- 8 – 12μm: For thermal imaging applications.
Due to its high index of refraction, an anti-reflection coating is recommended on these Ge windows for sufficient transmission. Germanium is subject to thermal runaway, meaning that the transmission decreases as temperature increases. As such, these germanium windows should be used at temperatures below 100°C. The high density of germanium (5.33 g/cm³) should be considered when designing for weight-sensitive systems. The Knoop Hardness of germanium (780) is approximately twice that of magnesium fluoride, making it ideal for infrared applications requiring rugged optics.
Picture Show of Our Diameter 60mm Thickness 5mm Windows/Ge Wafers
Properties 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 | Germanium (Ge) |
| Surface Quality | 60-40 |
| Thickness Tolerance (mm) | ±0.1 |
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