Optical Fluoride Crystals: BaF2
Optical Fluoride Crystals: BaF2
Description
BaF2 (Barium Fluoride) is an optical fluoride crystal that has a cubic crystal structure. It is an ionic compound consisting of barium cations (Ba2+) and fluoride anions (F-) arranged in a face-centered cubic lattice.
BaF2 is a popular 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.
In addition, BaF2 has excellent optical properties that make it useful for many applications in the field of spectroscopy. It has a low fluorescence background, which makes it useful for fluorescence spectroscopy. It is also transparent to X-rays, making it useful as a scintillation material for X-ray detectors.
BaF2 is also used in various applications in the semiconductor industry. It is used as a material for manufacturing optical components in lithography systems, which are used to fabricate microchips and other electronic devices.
Furthermore, BaF2 has potential applications in the field of high-energy physics as a scintillation detector. It has a high light yield and a fast decay time, making it useful for detecting high-energy photons and particles.
Physical Properties:
| Material | BaF2 |
| Transmission range (thickness 10 mm), µm | 0.15 - 15.00 |
| Crystal structure | cubic |
| Lattice constant, Å | a = 6.196 |
| Density, g/cm3 | 4.89 |
| Mohs hardness | 3 |
| Refractive indexes | n = 1.4686 |
| Solubility, g/100 g water at 18°C | 0.12 |
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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