Magnesium Fluoride (MgF2)

Publisher Summary Magnesium fluoride (MgF2) is a tetragonal material with TiO2 (rutile) structure. The unit cell contains two formula units. Magnesium ions occupy octahedral sites with D2h point symmetry. Fluorine-ion positions in the unit cell are known from X-ray diffraction measurements. A wide transparency range from 0.12 to 8 μm, good mechanical properties, and low optical index of refraction makes magnesium fluoride a desirable material for coatings and interference filters. MgF2 is a positive uniaxial material, with its highest birefringence in the ultraviolet. It occurs naturally as the mineral selliate. Single-crystal MgF2 is widely used for windows, lenses, polarizers, and other optical components. Optical-quality, hot-pressed polycrystalline MgF2 is also used for optical components, particularly in the infrared. MgF2 is used as a divalent-ion host material for solid-state lasers. Vanadium, nickel, and cobalt are used as dopants to produce tunable solid-state lasers in the infrared. The ultraviolet and Infrared transparency of MgF2 lends itself to many applications.

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