MgF2 is a tetragonal positive birefringent crystal. MgF2 has good chemical, mechanical and thermal characteristics compared with CaF2. Due to its high vacuum UV transmission and high damage threshold, MgF2 is usually used in VUV and excimer laser windows, polarizers, lenses and etc.
Lattice Constant: a=4.621A; c=3.053A
Mohs Hardness: 6
Density: 3.17g/cm3
Transparency Range: 120nm ~ 7000nm
Thermal Conductivity: 0.0075W/m/K
Thermal Expansion Coefficient: ||a=13.7x10-6/K, ||c=8.48x10-6/K
Index of Refraction: @405nm no=1.3836, ne=1.3957
Specifications
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Material
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MgF2 single crystal
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Dimension Tolerance
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+0.0/-0.1mm
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Thickness Tolerance
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±0.2mm
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Clear Aperture
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>90%
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Parallelism
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<1 arc minutes
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Surface Quality
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80/50 or 60/40 or 40/20
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Flatness
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<λ /2@633nm or better
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Chamfer
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Protected <0.5mmx45deg
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Coating
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None, per your request
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