Optical Fluoride Crystals: MgF2
Optical Fluoride Crystals: MgF2
Description
MgF2 (Magnesium Fluoride) is an optical fluoride crystal that has a tetragonal crystal structure. It is an ionic compound consisting of magnesium cations (Mg2+) and fluoride anions (F-) arranged in a tetragonal lattice.
MgF2 is a popular optical material due to its wide transparency range, low refractive index, and high chemical and thermal stability. It is transparent in the ultraviolet (UV) to infrared (IR) range, making it useful for optical components such as lenses, prisms, and windows.
In addition, MgF2 has excellent optical properties that make it a preferred material for use in ultraviolet (UV) optical coatings. Its low refractive index and high resistance to UV radiation make it an excellent antireflection coating material for use in optical systems that operate in the UV range.
MgF2 is also used in various applications in the semiconductor industry. It is used as a material for manufacturing optical components in lithography systems, which are used to fabricate microchips and other electronic devices. MgF2 is also used as a material for manufacturing plasma display panels (PDPs), which are used in high-definition televisions and computer monitors.
Physical Properties:
| Material | MgF2 |
| Transmission range (thickness 10 mm), µm | 0.11 - 8.0 |
| Crystal structure | tetragonal |
| Lattice constant, Å | a = 4.64; c = 3.06 |
| Density, g/cm3 | 3.177 |
| Mohs hardness | 6 |
| Refractive indexes | ne = 1.3852; no = 1.3796 |
| Solubility, g/100 g water at 18°C | 7.6 x 10-3 |
Specifications for windows:
| Surface quality, scratch - dig | 60 - 40 |
| Clear aperture | 90% of diameter |
| Diameter tolerance, mm | +0.0 / -0.1 |
| Thickness tolerance, mm | ± 2 |
| Flatness | »/4 (633 nm) |
| Parallelism, arc min | 3 |
| ” N | < 0.5 x 10-5 |
| Optical losses, cm-1 for MgF2-UV (200 nm) | < 0.07 |
| Optical losses, cm-1 for MgF2-UV (500 nm) | < 0.02 |
| Optical losses, % for CaF2 (4 µm) | 5.6 (two surfaces) |
| Optical losses, cm-1 for BaF2 | at 0.2 µm - < 0.20; 0.4 µm - < 0.08; 10.6 µm - < 0.13 |
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