Lithium fluoride 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.
Specifications
Transmission Range
0.12 to 6 μm
Reflection Loss
5.2% @ 0.6 μm (Two surfaces)
Absorption Coefficient
0.74 x 10-3 cm-1 at 2.7 μm
Refractive Index
1.392 @ 0.6 μm
Melting Point
870 °C
Hardness
Knoop 102 with 600g indenter
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