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Lithium Fluoride (LiF) crystal

Lithium Fluoride (LiF) crystal

Introduction:

The transmittance of Lithium fluoride crystals are ranges from vacuum ultraviolet 105 nm to infrared 6.0 μm, which is the best material for vacuum ultraviolet transmission. The crystals are widely used to fabricate optical windows, lenses, prisms, and refractive elements in the ultraviolet-visible-infrared field. In addition, LiF crystal can be used as an X-associated detector crystal. The crystal can be used directly without an anti-reflective coating becuse the lower refractive index. As a window material, LiF crystal is an excellent achromatic and complex color difference materials, which widely used in ultraviolet, infrared transmission window lenses and prisms in optical instruments.

Physical Properties

Material LiF
Crystal Structure  Single crystal, synthetic  
Crystal Type  Cubic, NaCl type structure, a= 4.02 Å  
Density(g/cm3) 2.63905 g/cm3
Melting point 870℃, 848℃
Index of refraction 1.37327 @2.5 µm; 1.624 @0.121 µm
Reflective Loss 4.4% @4.0 µm  
Hardness 102-113 (Indenter load: 600g)  
Flexible coefficient C11=112, C12=45.6, C44=63.2 GPa  
Thermal expansion 11.3 W/(m·K) @41°C 
Dielectric constants 9.0 @25°C, f = 100...109 Hz 

Specification

Size 145 mm, 200 mm  
Special size and orientation are available upon request
Polished SSP or DSP
Orientation <100>
Redirection precision ±0.5°
Angle of crystalline Special size and orientation are avaiable for request
Ra: ≤5Å(5µm×5µm)
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