Magnesium Fluoride or MgF2is grown by vacuum Stockbarger
technique in ingots approximately 120mm in diameter. It is a positive
birefringent crystal with high optical transmittance from the vacuum
ultraviolet to the infrared spectrum region. It is resistant to
mechanical and thermal shock, to radiation, and is chemistry stable.
MgF2transmits well into the VUV region at the hydrogen
Lyman-alpha line (121nm) and beyond. It is also used for most UV
optics and is excellent for eximer laser application
Physical
Properties
| Structure |
Tetragonal |
| Solubility at 18¡ãC |
0.0076g (per 100g water) |
| Lattice Constant |
a=4.621?; c=3.053? |
| Density |
3.18g/cm3 |
| Mohs Hardness |
6 |
| Melting Point |
1255¡ãC |
| Transparency Range |
0.12 ~ 8.5¦Ìm |
| Thermal Conductivity |
3.14W/m¡¤K |
| Expansion Coefficient |
||C: 14.3;©Ø
C: 9.15 (10-6/K) |
Index of Refraction
Wavelength (nm) |
no |
ne |
Wavelength (nm) |
no |
ne |
178 |
1.43975 |
1.45365 |
656 |
1.37661 |
1.38835 |
436 |
1.38203 |
1.39402 |
1000 |
1.37964 |
1.38521 |
488 |
1.38016 |
1.39206 |
2000 |
1.36800 |
1.37922 |
546 |
1.37855 |
1.39039 |
3000 |
1.36000 |
1.37060 |
588 |
1.37770 |
1.38960 |
5000 |
1.33020 |
1.33930 |
|
