Magnesium fluoride crystal (MgF₂) belongs to the tetragonal crystal system, with a melting point of 1255°C. It exhibits high hardness, excellent mechanical properties, and stable chemical characteristics, including resistance to deliquescence and corrosion. Within the vacuum spectral range of 110 nm (ultraviolet) to 7.5 μm (infrared), MgF₂ crystal demonstrates exceptional transmittance and a low refractive index, resulting in minimal refractive index loss. A key optical feature is its high transmittance in the vacuum ultraviolet band, maintaining over 80% transmittance at 170 nm. This crystal is widely used in fiber-optic communications, defense technologies, and various optical components such as windows, mirrors, lenses, prisms, polarizers, wedges, and substrates. Additionally, MgF₂ is the only crystal that combines a broad spectral transmission range with intrinsic birefringent properties.
Huilei Optical Electric Technology