MAGNESIUM FLUORIDE (MgF2) windows and lenses

Alkor Technologies manufactures DUV/VUV grade MgF2 optical elements: MgF2 lenses, MgF2 windows, MgF2 wedges according to customer's specifications.

The largest dimensions of MgF2 optics is 50 mm diameter. Please contact us for more information.

MgF2 window transmission

MgF2 window transmission, from DUV to IR. Sample thickness 10mm.

Magnesium Fluoride is used for optical elements in the infrared where extreme ruggerness and durability is required. The single MgF2 crystal exhibits slight birefringence through its useful transmission range and its birefringence in the infrared could be useful.

Magnesium Fluoride is similar to Calcium Fluoride in its resistance to water. The MgF2 windows is sensitive to thermal shock, but does not cleave. Irradiation does not lead to color centers. MgF2 transmits well into the DUV / VUV region at the hydrogen Lyman-alpha line (121nm) and beyond. MgF2 windows and lenses are also used for most UV optics and is excellent for eximer laser application.

Chemical Formula	MgF₂
Crystal Class	tetragonal
Lattice Constant, Å	a=4.64; c=3.06
Molecular Weight	62.31
Density, g/cm³ at 291 K	3.18
Reflection Loss, % for two surfaces in the visible	4.8
Dielectric Constant for 95 x 10³-42x10⁶ Hz	5.45
Melting Temperature, K	1528
Thermal Conductivity, W/(m K) at 300 K	14-15
Thermal Expansion, 1/K at 310 K parallel perpendicular	14x10^-6 8.9x10^-6
Specific Heat, cal/(g K) at 298 K at 1700 K	0.24 0.362
Bandgap, eV	10.8
Solubility in water	None
Knoop Hardness, kg/mm²	415
Young's Modulus, GPa	138.5
Shear Modulus, GPa	54.66
Bulk Modulus, GPa	101.32
Apparent Elastic Limit, MPa	49.64
^{Poisson Ratio}	0.276

Wavelength, µm	0.20	0.23	0.27	0.34	0.56
Refractive Index (n_e)	1.43	1.42	1.41	1.40	1.39
Refractive Index (n_o)	1.42	1.41	1.40	1.39	1.38

Tel: +7(812)3631240

Fax: +7(812)3631239

Email: technologies@alkor.net