LiF crystals shows excellent transmittance in the VUV region. It is used for windows, prisms, and lenses in the visible and infrared in 0.104 µm – 7 µm. LiF crystalis sensitive to thermal shock and would be attacked by atmospheric moisture at 400°C. In addition irradiation produces color centers. Modest precautions should be taken against moisture and high energy radiation damage. Besides LiF is softens at 600°C and is slightly plastic that can be bent into radius.
Parameter
Property | Value |
Chemical formula | LiF |
Crystal structure | Cubic |
Lattice parameters | a = 4.026Å |
Density | 2.64 g/cm3 |
Melting Point | 870°C |
Refractive Index | n=1.387 @1.0 µm |
Thermal Conductivity at 314K / (W·m-1·K-1) | 4.01 |
Thermal Expansion @283K (K-1)/ | 1.046 |
Specific Heat/ (J·g-1·K-1) | 1562 |
Hardness (Mohs) | 102 |
Young`s Modulus /GPa | 64.79 |
Shear Modulus / GPa | 55.14 |
Orientation | [100] or [111] < ±0.5° |
Poisson Ratio | 0.326 |
Solubility in 100g water at 200°C | 0.27 |
Absorption coefficient at 2.7µm (cm-1) | 0.74×10-3 |
Property | Value |
Spectal Range | UV, VIS, IR |
Surface quality | 60-40 S&D |
Clear aperture | 90% of the diameter |
Diameter tolerance | +0, -0.1 mm |
Thickness tolerance | ±0.1 |
Surface flatness | λ/4 @ 633 nm |
Parallelism | <3 arcmin |
Property | Value |
Orientation Tolerence | < 1° |
Thickness/Diameter Tolerance | ±0.10 mm |
Surface Flatness | <(λ-2λ) @632nm |
Wavefront Distortion | <(2-4)λ @632nm |
Surface Quality | 80/50 |
Parallel | 10ꞌ |
Perpendicular | 60ꞌ |
Clear Aperture | >90% |
Chamfer | <0.2×45° |
Property | Value |
Orientation Tolerence | < 0.5° |
Thickness/Diameter Tolerance | ±0.10 mm |
Surface Flatness | <(λ/2-λ/4) @632nm |
Wavefront Distortion | <(1-2)λ @632nm |
Surface Quality | 60/40 |
Parallel | 1ꞌ |
Perpendicular | 60ꞌ |
Clear Aperture | >90% |
Chamfer | <0.2×45° |
Property | Value |
Orientation Tolerence | < 0.2° |
Thickness/Diameter Tolerance | ±0.02 mm |
Surface Flatness | <(λ/4-λ/6) @632nm |
Wavefront Distortion | <(λ-λ/2) @632nm |
Surface Quality | 40/20 |
Parallel | 45ꞌ |
Perpendicular | 20ꞌ |
Clear Aperture | >90% |
Chamfer | <0.2×45° |
- Excellent Transmission from 110um to 7um
- Optically isotropic,middle hard
- Hygroscopic ,unsolvable in water
- Senitive to thermal shock
- UV transmission window
- X-Ray monochromator plates
- Radiation detectors
- Cathode for PLED and OLED
More Picture
LiF Window
4×4×0.12 mm
Both sides polished
LiF Window
4×1.9×0.12 mm/ 1.1×0.4×0.12 mm
Both sides polished
LiF Window
4×1.9×0.12 mm
Both sides polished
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