The transmittance of lithium fluoride crystal ranges from 110 nm in vacuum ultraviolet to 6.0 μm in infrared, and it is the material with the best transmittance in the vacuum ultraviolet region. This crystal is widely used to prepare optical windows, lenses, prisms and refractive elements in the ultraviolet-visible-infrared field. The low refractive index allows the crystal to be used directly without anti-reflection coating. Lithium fluoride crystals can also be used as X-ray detector crystals, as well as coating materials for OLED display screens. We can provide high-quality lithium fluoride single crystals grown by pulling and descending methods.
| Detailed Parameter | |
| Crystal structure | Cube |
| Lattice constant | a=4.026 Å |
| Melting point（℃） | 870 |
| Density（g/cm3） | 2.635 |
| Hardness | 4.0（mohs） |
| Thermal expansion coefficient | 37.0 x 10-6 /K |
| Refractive index | n=1.39 |
| Transmission band | 0.11-7.00 μm |
| Transmittance | > 90% @0.2~4.5 μm; |
| Color deviation Hf-Hc | 0.00395 |
| temperature-coefficient dh/dt x 10-6 | 12.7 @0.6 m |
| Crystal growth method | Bridgeman or CZ |
| Cleavage plane | <100> |
| Size | 10*10，20*20，30*30，Ø50.8mm |
| Hardness | 0.5mm，1.0mm （Can be customized） |
| Polishing | Single-sided or double-sided |
| Crystal plane orientation accuracy | ±0.5° |
| Edge orientation accuracy | 2°（Special requirements can reach within 1°） |
| Ra: | ≤10Å（5µm×5µm） |
| package | Class 100 clean bag, Class 1000 super clean room |
