The CVD polycrystalline diamond optical sheet produced by our company has excellent optical and mechanical properties. Thermal stability ; From X-ray, ultraviolet light, visible light, infrared light to millimeter microwave band has a high transmittance, excellent mechanical properties and thermal stability, can provide 100 times more power processing capacity than traditional infrared optical materials and used in harsh environments, is an excellent optical material.
| CVD | ZnSe | ZnS | Ge | Si | GaAs | Al2O3 | |
| Band gap /eV | 5.48 | 2.7 | 3.9 | 0.664 | 1.11 | 1.142 | 9.9 |
| Absorption coefficient | 0.1 ~ 0.3 | 0.005 | 0.2 | 0.02 | 0.35 | 0.01 | |
| Microhardness /(kg/mm2) | 8300 | 137 | 230 | 780 | 1150 | 721 | 190 |
| Refractive index | 2.38 | 2.40 | 2.19 | 4.00 | 3.42 | 3.28 | 1.63 |
| Thermal conductivity /(W/(cm.K)) | 18 to 22 | 0.19 | 0.27 | 0.59 | 1.63 | 0.55 | 0.35 |
| Coefficient of thermal expansion /10-6K-1 | 1.3 | 7.6 | 7.9 | 5.9 | 2.56 | 5.9 | 5.8 |
| item | argument |
| Vickers hardness | 8000~10000 kg/mm² |
| density | 3.51 g/cm after |
| Young's modulus | 1000~1100GPa |
| Coefficient of thermal expansion | 2.3 x10-6 & have spent 1 ℃ - |
| Cutting tolerance | 0.030 mm or less |
Note: Single side or double side polishing, shape and size can be cut according to customer requirements.
