Lithium Fluoride LiF optics as transmission windows, lenses, viewports, prisms, etc

Lithium Fluoride LiF Optics

Lithium Fluoride LiF Optics
Lithium Fluoride (LiF) is the material with the most extreme UV transmission of all and is used for special UV optics. Lithium fluoride transmits well into the VUV region at the hydrogen Lyman-alpha line (121nm) and beyond. Lithium fluoride is also used for X-ray monochromator plates where its lattice spacing makes it the most useful analysis crystal. Click on the spectral image above to enlarge for impression of VUV performance.

Contact REFLEX Analytical to discuss the fabrication of polished optics or unpolished blanks according to your specifications.

Material Characteristics

Transmission Range 0.12 to 6 microns Refractive Index 1.392 at 0.6 micron Reflection Loss 5.2% at 0.6 micron (2 Surfaces) Absorption Coefficient 5.9 x 10-3 cm-1 at 4.3 microns @ 300K Reststrahlen Peak 25 microns dn/dT -16 x 10-6 at 1.15 microns dn/du = 0 : 1.3 microns Density 2.639 g/cc Melting Point 848 C Thermal Conductivity 4.01 W m-1 K-1 at 314 K Thermal Expansion 37 x 10-6 K-1 at 283 K Hardness Knoop 102 with 600g indenter Specific Heat Capacity 1562 J Kg-1 K-1 Dielectric Constant 0.1 Youngs Modulus (E) 64.97 GPa Shear Modulus (G)55.14 GPa Bulk Modulus (K) 62.03 GPa Elastic Coefficients C11=112; C12=46; C44=63.5 Apparent Elastic Limit 11.2 MPa (1620 psi) Poisson Ratio 0.326 Solubility 0.27g / 100g water at 20 C Molecular Weight 25.94 Class/Structure Cubic FCC, NaCl, Fm3m, (100) cleavage
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