MgF2 (Magesium Flouride) material
MgF2 (Magesium Flouride) is transparent over a extremely wide range of wavelengths .windows, lenses ,and prisms made of this materials can be used over the entire range of wavelengths from 0.12μm(vacuum ultraviolet ) to 8.0μm (infrared). High quality synthetic VUV grade MgF2 is quite expensive. Low grade MgF2 is sometimes used in the infrared but it is inferior to CaF2. MgF2 is tough and works and polishes well, but it is slightly birefringent and should be cut with the optic axis perpendicular to the plane of the window or lens.
We have all kinds of orientation, such as <111>、<110>、<100> etc.
We have all shapes of material, such as round rod、square plate、step、prism、wedge and so on.
We have all kinds of conventional plate、spherical and wedge in our stock.
We have the size of 4mm-200mm mono crystal and poly crystal materials and optical element
Optical Properties
Transmission Range
110 nm to 7.5 μm
Transmittance
>90% at 193 nm to 6 μm
Refractive Index
No=1.37608; Ne=1.38771 (at 0.7μm)
Reflection Loss
5.2% at 0.6 μm (both surfaces)
Residual Radiation Peak
20 nm
Absorption Coefficient
0.04 cm-1 at 2.7 μm
dn/dT
2.3 x 10-6 /℃ parallel c-axis
1.7 x 10-6 /℃ perpendicular c-axis
Physical Properties
Density
3.18 g/cm3
Melting Point
1255℃
Thermal Conductivity
0.3 Wm-1K-1 at 300K
Thermal Expansion
13.7 x 10-6 /℃ parallel c-axis
8.9 x 10-6 /℃ perpendicular c-axis
Knoop Hardness
415 with 100g indenter (kg/mm2)
Specific Heat Capacity
1003 J/(kg.k)
Dielectric Constant
1.87 at 1MHz parallel c-axis
1.45 at 1MHz perpendicular c-axis
Youngs Modulus (E)
138.5 GPa
Shear Modulus (G)
54.66 GPa
Bulk Modulus (K)
101.32 GPa
Elastic Coefficient
C11=164; C12=53; C44=33.7
C13=63; C66=96
Apparent Elastic Limit
49.6 MPa (7200 psi)
Poisson Ratio
0.276
Chemical Properties
Solubility
0.0002 g/ 100g water at 20℃
Molecular Weight
62.32
Structure
Tetragonal Crystal
Cleavage Plane
-110
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