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Magnesium Fluoride MgF2

♦ Magnesium Fluoride (MgF2) SDS
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♦ Magnesium Fluoride (MgF2) Data Sheet
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Magnesium Fluoride transmits well into the VUV region to the hydrogen Lyman-alpha line (121nm) and beyond. Magnesium Fluoride is used mostly for UV optics and is excellent for Excimer laser applications. We normally cut and orient windows with the optic axis (the c-axis) [001] normal to the surface which is parallel with the (001) plane for minimum bifrefringence. The a-cut which is equivalent to b-cut can be selected if required for maximum birefrigence.

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Windows

Lenses

 

Transmission Range
0.12 to 7 μm (1)
Refractive Index
No 1.413 at 0.22 μm (4)
Reflection Loss
5.7% at 0.22 μm (2 surfaces)
Absorption Coefficient
40 x 10-3 cm-1 at 2.7 μm
Reststrahlen Peak
20 μm (1)
dn/dT
2.3 (para) 1.7 (perp) at 0.4 μm (1)
dn/dμ = 0
1.4 μm
Density
3.18 g/cc
Melting Point
1255°C
Thermal Conductivity
21 (para) 33.6 (perp) W m-1 K-1 at 300K (3)
Thermal Expansion
13.7 (para) 8.9 (perp) x 10-6 /K (1)
Hardness
Knoop 415
Specific Heat Capacity
1003 J Kg-1 K-1
Dielectric Constant
4.87 (para) 5.45 (perp) at 1MHz (1)
Youngs Modulus (E)
138 GPa (2)
Shear Modulus (G)
54.66 GPa (2)
Bulk Modulus (K)
101.32 GPa (2)
Elastic Coefficients
C11=140 C12=89 C44=57 C13=63 C66=96 (2)
Apparent Elastic Limit
26.9 MPa (3900psi) (4)
Poisson Ratio
0.276 (2)
Solubility
0.0002g/100g water
Molecular Weight
62.32
Class/Structure
Tetragonal P42/mnm (#136) Rutile Structure. Can cleave on c-axis but not easily.

 

µm No Ne
0.1146 1.7350 1.7295
0.1149 1.7420 1.7215
0.1156 1.7235 1.7080
0.1168 1.7000 1.6905
0.1179 1.6800 1.6750
0.1198 1.6510 1.6520
0.1215 1.6280 1.6320
0.130 1.566 1.568
0.140 1.5095 1.523
0.150 1.480 1.494
0.160 1.461 1.475
0.170 1.448 1.462
0.180 1.439 1.453
µm No Ne
0.190 1.431 1.444
0.200 1.432 1.437
0.220 1.413 1.426
0.248 1.403 1.416
0.257 1.401 1.414
0.266 1.399 1.412
0.280 1.396 1.409
0.300 1.393 1.405
0.330 1.393 1.402
0.337 1.389 1.401
0.350 1.387 1.400
0.355 1.386 1.399
0.400 1.384 1.396
µm No Ne
0.546 1.379 1.390
0.700 1.376 1.388
1.087 1.373 1.385
1.512 1.370 1.382
2.00 1.368 1.379
2.50 1.364 1.375
3.030 1.360 1.370
3.571 1.354 1.364
4.00 1.349 1.359
4.546 1.341 1.350
5.00 1.334 1.343
5.556 1.324 1.332
6.060 1.314 1.321

Magnesium Fluoride is grown by vacuum Stockbarger technique in ingots of various diameters. Magnesium Fluoride is a tough material and polishes well. Therefore, it can be worked to the highest standards. MgF2 is slightly birefringent and usually supplied with the optic axis cut perpendicular to the window faces.

REFERENCES:
(1) Duncanson et.al. Proc.Phys.Soc. V72, p1001, 1958
(2) Kandil et.al. J.App.Phys. V52, p749, 1981
(3) Kashnow & MCarthy, J.Phys.Chem. V30, p813, 1969
(4) Laporte et. al. J.Opt. Soc. Am. V73, No 8, p1062

 

MgF2 Orientation 1

MgF2 Orientation 2

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