MgF2
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Infrared Optical Materials
Magnesium fluoride
There are two forms of Magnesium fluoride crystals used for infrared optical materials, single crystal and polycrystal.
Single crystal Magnesium fluoride:
1. Optical performance : Transmission band 0.11-9 μ m. Covering UV, visible light, and medium wave infrared, very excellent
2. Physical properties : Easy to deliquescence and poor processability
3. Preparation difficulty : The growth difficulty increases sharply with a diameter of 100mm or more.
Mainly used in ultraviolet optical systems, ultraviolet lasers and detectors, and infrared ultraviolet spectral components. Together with Calcium fluoride, sapphire, and ultraviolet fused quartz, it has become one of the few ultraviolet optical materials.
Polycrystalline Magnesium fluoride:
1. Optical performance : Transmission band 0.9-7 μ m. High self-transmittance, usually without the need for coating
2. Physical properties : High strength and excellent mechanical properties; Low dielectric constant, which can be combined with radar guidance to form a universal composite guidance material; Excellent thermal performance, high coefficient of thermal expansion, and high temperature resistance.
4.Preparation difficulty : Substrates of various sizes and shapes can be pressed by hot pressing.
The batch preparation technology of hot-pressed Magnesium fluoride crystal is mature, and the growth cost is low. However, due to the use of hot-pressing method in the growth process, there are many scattered particles and impurities inside, which greatly reduces the optical performance. It is mainly used for low-cost/high-precision mid wave infrared domes.
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