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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

Transparence 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

MgF2

MgF2 

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