Magnesium Fluoride is commonly used for optical components in wide spectrum band from the vacuum ultraviolet to the infrared, since it is transparent over the entire range of wavelengths (from 0.11-0.12 µm to 7.5-8.0 µm).
Magnesium Fluoride combines wide spectral transmittance bandwidth birefringence phenomenon. Its birefringence makes polarizing optics for the ultraviolet region possible. With Lithium Fluoride, it is one of the two materials that will transmit in the vacuum ultraviolet range at the hydrogen Lyman-alpha line (121nm).
Magnesium Fluoride is tough and is used if extreme ruggedness and durability is required. It is resistant to thermal and mechanical shock. Irradiation doesn’t lead to color centers. The material is used for the production of windows, prisms, lenses and other optical items in the range from the vacuum ultraviolet to the infrared.
We use for our optics high quality crystals growth on the Czochralsky and Bridgman Methods and supply high transparency and low loss optical windows, prisms, lenses, achromatic lenses and other optical components. Magnesium Fluoride is sold in two qualities (monodomain and polydomain) and in three grades – IR, UV and VUV grade.
|Transmission range in µm @10% min.||0.12 - 9.6|
|Transmission range in µm @50% min.||0.12 - 8.5|
|Refractive index @ 633nm||1.375 (no) 1.389 (neo)|
|Reflection losses in % at 1 surface||2.52 @ 633nm|
|Reflection losses in % at 2 surfaces||11.2 @ 120nm|
|dn/dT in 1/K||2.3 · 10-6 (parallel c-axis) 1.7 · 10-6 (perpendicular c-axis)|
|Density in g/cm³||3.177|
|Melting point in °C||1255|
|Specific heat capacity in J/(kg · K)||1004|
|Thermal Conductivity in W/(m · K)||21 (parallel) @300K 33.6 (perpendicular) @300K|
|Thermal Expansion in 1/K||13.7 · 10-6 (parallel) 8.9 · 10-6 (perpendicular)|
|Dielectric constant||4.87 (parallel) 5.45 (perpendicular)|
|Solubility in water in g/100g||2 · 10-4 @ 0-60°C|
|Knoop hardness in kg/mm²||415|
|Material type||Single crystal, synthetic|
|Lattice constant in Å||a = 4.0623 c = 3.053|
|Elastic coeficients in GPa||C11 = 138 C12 = 88 C13 = 62 C33 = 301 C44 = 56.5 C66 = 95.5|
|Young's Modulus (E) in GPa||138.55|
|Shear Modulus (G) in GPa||54.66|
|Bulk Modulus (K) in GPa||101.32|
|Rupture Modulus in MPa||60|
|Apparent elastic limit in MPa||49.6|