Optical Fluoride Crystals: LiF
Optical Fluoride Crystals: LiF
Description
LiF (Lithium Fluoride) is an optical fluoride crystal that has a cubic crystal structure. It is an ionic compound consisting of lithium cations (Li+) and fluoride anions (F-) arranged in a face-centered cubic lattice.
LiF is an excellent optical material due to its wide transparency range, low refractive index, and high chemical and thermal stability. It is transparent in the ultraviolet (UV) to infrared (IR) range, making it useful for optical components such as lenses, prisms, and windows.
LiF is also used in various applications in high-energy physics, where it is used as a scintillation detector for detecting high-energy photons and particles. It has a high light yield, fast decay time, and is non-hygroscopic, making it a useful scintillation material.
LiF is also used in dosimetry for measuring ionizing radiation, particularly in the medical field. It has a high sensitivity to radiation and can be used as a passive radiation detector.
Physical Properties:
| Material | LiF |
| Transmission range (thickness 10 mm), µm | 0.12 - 6.50 |
| Crystal structure | cubic |
| Lattice constant, Å | a = 4.026 |
| Density, g/cm3 | 2.60 |
| Mohs hardness | 4 |
| Refractive indexes | n = 1.387 |
| Solubility, g/100 g water at 18°C | - |
Specifications for windows:
| Surface quality, scratch - dig | 60 - 40 |
| Clear aperture | 90% of diameter |
| Diameter tolerance, mm | +0.0 / -0.1 |
| Thickness tolerance, mm | ± 2 |
| Flatness | »/4 (633 nm) |
| Parallelism, arc min | 3 |
| ” N | < 0.5 x 10-5 |
| Optical losses, cm-1 for MgF2-UV (200 nm) | < 0.07 |
| Optical losses, cm-1 for MgF2-UV (500 nm) | < 0.02 |
| Optical losses, % for CaF2 (4 µm) | 5.6 (two surfaces) |
| Optical losses, cm-1 for BaF2 | at 0.2 µm - < 0.20; 0.4 µm - < 0.08; 10.6 µm - < 0.13 |
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