| Polished coated lens/windows |
| Material | Ge, Si, ZnSe, ZnS,Chalcogenide glass |
| Specification | Customized |
| Dia tol. | W0.03 mm |
| Radius of curvature | ASag< 0.005 |
| Center thickness tol. | <0.025 mm |
| Variation of edge thickness | <0.03 mm |
| Surface finishing | 40/20 |
| Penetration rate | 1.Double-sided antireflection film N97% 2.Carbon film + permeable film N90% |
| Surface type | N<2 AN<1 |
| Flatness | <10um |
| Center Variation | 1.Window<30" 2.Penetration^<1.5* |