Magnesium fluoride (MgF2) is a birefringent optical crystal with a tetragonal crystal structure. It has a relatively high birefringence and is often used in polarizing optics, such as polarizers, wave plates, and optical filters.
MgF2 has a wide transmission range from the ultraviolet to the infrared and is highly transparent in the visible and near-infrared regions. It also has a low refractive index and a high resistance to mechanical and thermal shock, making it an ideal material for optical coatings and anti-reflection coatings.
One of the main applications of MgF2 is in the production of thin-film coatings for optical applications. MgF2 thin films are highly effective at reducing reflection and enhancing transmission, making them useful in a range of optical components, including lenses, mirrors, and windows.
In addition to its optical properties, MgF2 also has other useful properties, such as high thermal conductivity, low thermal expansion, and good chemical stability. These properties make it useful in various applications, such as in high-temperature windows, lenses for infrared cameras, and thermal imaging systems.
|Refractive index h at l= 0.63 µm||Thermal optical Coef. dh/dT 10-6/°K||Structure and lattice constant, Å||Melting point °C||Density g/ cm3||Hardness (Mohs)||Thermal Coef. 10-6/K|
|-||Tetragonal a=4.64 c=3.06||1312||3.18||3||a: 13.7 |