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Magnesium Fluoride or MgF2
is 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
chemically stable. MgF2 transmits 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.
Red Optronics can supply single
crystal MgF2 up to 98mm in diameter.
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Physical Properties
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| Solubility at 18°C |
0.0076g (per 100g water) |
| Structure
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Tetragonal |
| Lattice constant
|
a=4.621Å;
c=3.053Å |
| Density
|
3.18g/cm3 |
| Hardness |
6 Mohs |
| Melting point
|
1255°C |
| Transparency range |
0.12 ~ 8.5μm |
| Thermal conductivity |
3.14W/m·K |
| Expansion coefficient |
||C: 14.3 ; ┴ C: 9.15 (10-6/K) |
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Index of Refraction
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| 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 |
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