MgF2
Magnesium Fluoride (MgF2 crystal) is used for optical elements where extreme ruggedness and durability is required. Its useful transmission range is 0.11 μm - 8.5 μm. MgF2 single crystals is a positive crystal and slight birefringence and usually supplied with the optic axis cut perpendicular to the window faces.
| Major capability parameter
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| Crystal structure | M3 |
| Unit cell constant | a=5.462 Å |
| Melt point（℃） | 1418 |
| Density | 3.18（g/cm3） |
| Hardness | 4（mohs） |
| Thermal expansion | 18.85 x 10-6 /℃//c |
| Index of refraction | Ho=1.43382 |
| Through scope | 0.11-12.00 |
| Temperature index dh/dt x 10-6 | 10.6 @0.8 m |
| Growth method | Bridgeman |
| Size | 10x3，10x5，10x10，15x15，，20x15，20x20， |
| dia2” x 0.33mm dia2” x 0.43mm 15 x 15 mm | |
| Thickness | 0.5mm，1.0mm |
| Polishing | Single or double |
| Crystal orientation | <001>±0.5º |
| redirection precision | ±0.5° |
| Redirection the edge: | 2°（special in 1°） |
| Angle of crystalline | Special size and orientation are available upon request |
| Ra: | ≤5Å（5µm×5µm） |
