Magnesium fluoride crystal (MgF2) belongs to the tetragonal crystal system, the melting point is 1255℃, the hardness is high, the mechanical properties are good, the chemical properties are stable, and it is not easy to deliquesce and corrode. The main feature of the optical performance is that it has high transmission in the vacuum ultraviolet band. It is widely used in optical fiber communication, military industry and various optical components.
| Main performance parameters | |
| Crystal structure | Quartet |
| Lattice constant | a=4.62 Å,c=3.06 Å, |
| Melting point（℃） | 1255 |
| Crystal growth method | Bridgeman |
| Density（g/cm3） | 3.18 |
| Hardness | 4（mohs） |
| Coefficient of thermal expansion（/℃） | 13.7×10-6 (∥c),8.9×10-6 (⊥c) |
| thermal conductivity /Wm-1K-1 | 0.3@300K |
| Refractive index | no=1.37608 ne=1.38771(0.7μm) |
| Transmission band | 0.2-6.00μm |
| Transmittance | > 90% @ 0.2-6.00μm |
| Size | 5x5，10x10， 20x20，Ø50.8mm. |
| Thickness | 0.5mm，1.0mm（Can be customized） |
| Polishing | Single-sided or double-sided |
| Crystal orientation | <001>±0.5º |
| Crystal plane orientation accuracy | ±0.5° |
| Edge orientation accuracy | 2°（Special requirements can reach within 1°） |
| Bevel wafer | According to specific requirements, wafers with edge-oriented crystal planes inclined at a specific angle (inclination angle 1°-45°) can be processed |
| Ra: | ≤10Å（5µm×5µm） |
| Package | Class 100 clean bag, Class 1000 super clean room |
