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MgF2
Magnesium Fluoride (MgF2)transmits well into the VUV
region at the hydrogen Lyman-alpha line (121nm) and beyond.
Application as window, lens, in most VUV region optics and is
excellent for excimer laser use.
MgF2 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.
Main Properties
Crystal properties |
Crystal Growth Method |
Vacuum Stockbarger |
Max. Size (mm) |
<100 |
Optical properties |
Transmission range (¦Ìm) |
0.12~7.00 |
Reflection Loss, % for two surfaces at 5 ¦Ìm |
4.8 |
Refractive Index |
See below |
Wavelength (um) |
No |
Ne |
Wavelength (um) |
No |
Ne |
0.121 |
1.62750 |
1.63200 |
0.656 |
1.37661 |
1.38835 |
0.140 |
1.50950 |
1.52300 |
1.000 |
1.37360 |
1.38521 |
0.178 |
1.43975 |
1.45365 |
2.000 |
1.36800 |
1.37922 |
0.200 |
1.42309 |
1.43657 |
3.000 |
1.36000 |
1.37060 |
0.300 |
1.39298 |
1.40543 |
4.000 |
1.35250 |
1.36220 |
0.436 |
1.38203 |
1.39402 |
5.000 |
1.33020 |
1.33930 |
0.488 |
1.38016 |
1.39206 |
6.000 |
1.32420 |
1.33150 |
0.588 |
1.37770 |
1.38960 |
7.000 |
1.30440 |
1.31010 |
| Transmission Curve |
See below |
|
Crystallographic properties |
Syngony |
Tetragonal |
Lattice Constant, Å |
a=4.64; c=3.06 |
Cleavability |
(100),(110), imperfect |
Physical properties |
Density, at 291 K |
3.18g/cm3 |
Hardness, Mohs |
6 |
Dielectric Constant for 95x103 - 42x106
Hz |
5.45 |
Melting point, ¡ãC |
1255 |
Thermal Conductivity, W/m¡¤K |
3.14 |
Thermal Expansion, K
Parallel to c-axis
(//)
Perpendicular to c-axis
(¡ª ) |
14 ¡Á 10-6
8.9 ¡Á 10-6
|
Bandgap, eV |
10.8 |
Knoop Hardness, kg/mm2 |
415 |
Young's Modulus, GPa |
138.5 |
Shear Modulus, GPa |
54.66 |
Bulk Modulus, GPa |
101.32 |
Apparent Elastic Limit, MPa |
49.64 |
Poisson Ratio |
0.276 |
Chemical properties |
Solubility in water at 18¡ãC |
0.0076g (per 100g water) |
Molecular Weight |
62.31 |
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