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MgF2

Magnesium Fluoride (MgF2) transmits well into the VUV region at the hydrogen Lyman-alpha line (121nm) and beyond. Application as window, lens, in most VUV region optics and is excellent for excimer laser use.

MgF2 is a positive birefringent crystal with high optical transmittance from the vacuum ultraviolet to the infrared spectrum region. It is resistant to mechanical and thermal shock, to radiation, and is chemically stable.


Main Properties

 

Crystal Properties
Crystal Growth Method Vacuum Stockbarger
Max. Size (mm) <100
Optical Properties
Transmission range (m) 0.12~7.00
Reflection Loss, % for two surfaces at 5 m 4.8
dN/dT 2.3 and 1.7x10-6/ C @ 0.4 m
Refractive Index See below
Wavelength (m)
no
ne
Wavelength (m)
no
ne
0.121
1.62750
1.63200
0.656
1.37661
1.38835
0.140
1.50950
1.52300
1.000
1.37360
1.38521
0.178
1.43975
1.45365
2.000
1.36800
1.37922
0.200
1.42309
1.43657
3.000
1.36000
1.37060
0.300
1.39298
1.40543
4.000
1.35250
1.36220
0.436
1.38203
1.39402
5.000
1.33020
1.33930
0.488
1.38016
1.39206
6.000
1.32420
1.33150
0.588
1.37770
1.38960
7.000
1.30440
1.31010
Transmission Curve See below

Crystallographic Properties

Syngony Tetragonal
Lattice Constant, Angstrom (Å) a=4.64; c=3.06
Cleavability (100),(110), imperfect
Physical Properties
Density, at 291 K 3.18g/cm3
Mohs Hardness 6
Dielectric Constant for 95x103 - 42x106 Hz 5.45
Melting point, C 1255
Thermal Conductivity, W/mK 3.14
Thermal Expansion, K
Parallel to c-axis (//)
Perpendicular to c-axis ()

14x10-6

8.9x10-6
Bandgap, eV 10.8
Knoop Hardness, kg/mm2 415
Youngs Modulus, GPa 138.5
Shear Modulus, GPa 54.66
Bulk Modulus, GPa 101.32
Apparent Elastic Limit, MPa 49.64
Poisson Ratio 0.276
Chemical Properties
Chemical Formula MgF2
Molecular Weight 62.32
Solubility in water at 18C 0.0076g (per 100g water)

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