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Current location: IR Crystals
| Magnesium Fluoride (MgF2 crystal) is used for optical elements where extreme ruggedness and durability is required. Its useful transmission range is 0.11 μm - 8.5 μm. MgF2 single crystals is a positive crystal and slightly birefringent and usually supplied with the optic axis cut perpendicular to the window faces. | |
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Magnesium Fluoride (MgF2) is a very hard, durable material transmitting from the UV to the mid-infrared. This makes it a useful material for broad-band and multiband systems and also for optics which are required to withstand severe environmental conditions.
Typical specifications for surface quality in the visible and near infrared regions are a 40-20 scratch dig in the 3 to 7μm range. Surfaces better than 20/10 can be achieved cost-effectively. | |
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Magnesium Fluoride (MgF2) is a tetragonal positive birefringent crystal grown using the vacuum Stockbarger technique. MgF2 is the only one optical material combiningwide spectral transmission band with birefringence phenomenon.
With high infrared transmittance, small thermal expansion coefficient, good mechanical property, and low preparation cost, Hot-Pressed Polycrystalline Magnesium Fluoride(HP MgF2)is the best material for mid-infrared wave vector dome.
Magnesium Fluoride is one of the lowest index infrared materials, second only to Lithium Fluoride. MgF2 is commonly used for optical elements where extreme ruggedness and durability is required. Its useful transmission range is 0.11 μm - 8.5 μm. Irradiation does not lead to color centers. It is a rugged, hard material which is resistant to thermal and mechanical shock and can be worked to the highest standards. |
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(1) High optical transmittance from the vacuum ultraviolet to the infrared spectrum region(0.118.5μm).
(2) Resistant to mechanical and thermal shock, to radiation.
(3) Chemically stable.
(4) Used for Optical prisms, lenses, wedges, windows, other optical components,and etc.
(5) A positive birefringent crystal, used for optical fiber communication
Main Properties of MgF2 crystal:
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Formula |
MgF2 |
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Density |
3.18 g/cm3 |
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Melting Point |
1255℃ |
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Boiling point |
2239℃ |
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Molecular Weight |
62.32 |
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Thermal Conductivity |
3.15W/m K |
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Specific Heat |
920 J/(kg K) |
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Thermal Expansion |
⊥C 9×10–6 ∥C 14 ×10–6 / K |
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Hardness (Knoop) |
415,576 kg/mm2 |
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Hardness (Mho) |
5--6 |
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Young’s Modulus |
138.5 GPa |
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Shear Modulus |
54.66 GPa |
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Bulk Modulus |
101.32 GPa |
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Rupture Modulus |
49.6 MPa |
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Elastic Coefficient |
C11=140 C12=89 C44=57 C13=63 C66=96 |
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Dielectric Constant |
105 ~107 Hz 5.45 |
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Solubility in Water |
0.0076 g / 100 g, 18℃ |
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Lattice Constant |
a=4.64 Å, c=3.06 Å |
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Crystal Type |
Tetragonal,P42/mnm |
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Cleavage Planes |
(100), (110) |
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Absorption Coefficient |
0.07 at 0.2µm,0.02 at 5.0µm |
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Poisson's Ratio |
0.276 |
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Transmission Range |
0.11 - 8.5 |
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Vapour Pressure |
1 Pa(at 1150℃), 10 Pa(at 1300℃) |
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Applications |
IR, UV , VUV and Excimer |
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Fluorescence |
weak yellow upon excitation at 590 nm | | | |
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