| Product name | Germanium single crystal window |
| Material | Ge (germanium) |
| Shape tolerance | 1-200mm +0.0/-0.1 |
| Thickness tolerance | 1-15mm +0.1, 1-30mm +0.1 |
| Surface type | N=3, λ/4, λ/5 |
| Parallelism | 3', <1' |
| Smoothness | 60-40 |
| Effective aperture | >90% |
| Inverted side | <0.2x45° |
| Plating film | coustom design |
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