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Home > Products > Optical Products > Optical Materials > MgF2 |
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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. |
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| Main Properties |
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| 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 |
| dN/dT |
2.3 and 1.7x10-6/ ¡ãC @ 0.4 ¦Ìm |
| Refractive Index |
See below |
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Wavelength (¦Ìm) |
no |
ne |
Wavelength (¦Ìm) |
no |
ne |
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0.121 |
1.62750 |
1.63200 |
0.656 |
1.37661 |
1.38835 |
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0.140 |
1.50950 |
1.52300 |
1.000 |
1.37360 |
1.38521 |
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0.178 |
1.43975 |
1.45365 |
2.000 |
1.36800 |
1.37922 |
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0.200 |
1.42309 |
1.43657 |
3.000 |
1.36000 |
1.37060 |
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0.300 |
1.39298 |
1.40543 |
4.000 |
1.35250 |
1.36220 |
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0.436 |
1.38203 |
1.39402 |
5.000 |
1.33020 |
1.33930 |
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0.488 |
1.38016 |
1.39206 |
6.000 |
1.32420 |
1.33150 |
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0.588 |
1.37770 |
1.38960 |
7.000 |
1.30440 |
1.31010 |
| Transmission Curve |
See below |
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Crystallographic Properties |
| Syngony |
Tetragonal |
| Lattice Constant, Angstrom (Å) |
a=4.64; c=3.06 |
| Cleavability |
(100),(110), imperfect |
| Physical Properties |
| Density, at 291 K |
3.18g/cm3 |
| Mohs Hardness |
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) |
14x10-6
8.9x10-6 |
| Bandgap, eV |
10.8 |
| Knoop Hardness, kg/mm2 |
415 |
| Youngs 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 |
| Chemical Formula |
MgF2 |
| Molecular Weight |
62.32 |
| Solubility in water at 18¡ãC |
0.0076g (per 100g water) |
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