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| Shape | Circles, rectangles, polygons and other shapes |
| Size | Diameter：Φ3-Φ150mm |
| Thicness：0.05-50mm | |
| Flatness | PV:1/4-1/10λ |
| Finish | 10-5 20-10 40-20 |
| Roughness | ＜5nm |
| Parallelism | ＜20″ |
| Coatting | Custom |
Barium fluoride (BaF2) has an optical transmittance close to 90% in the 200-9500nm spectrum. Usually used in cryogenic imaging system, laser optical system lens, beam splitter, filter, prism and window. The material has some water solubility and is only suitable for use in dry environments.
Physicochemical property
| Ddensity（ g/cm3） | 4.89 |
| Melting temperature（℃） | 1280 |
| hermal expansivity（1/℃） | 1.81*10^-6@-100……+200 |
| Chemical purity（%） | 99.9996 |
| Elasticity modulus（GPa） | 56.4 |
| Shear modulus（GPa） | 25.4 |
| Thermal capacity（J/k.m.s） | 11.72@286K |
| Heat capacity（J/g.k） | 0.410@300K |
| Knoop hardness(kg/mm2) | 82 |
| Water solubility（g/l） | 1.7 |
| Young's modulus(GPa) | 53.07 |
| Poisson's ratio | 0.343 |
Optical property
| Through wavelength range | 150nm-12500nm |
| Absorptivity（1/cm） | 3.2*10^-6@632.8nm |
| Thermo-optical coeffecient ，dn/dT（1/K） | -15.2*10^-6%@400nm |
| -12.7*10^-6%@3390nm（-60℃） | |
| -15.2*10^-6%@3390nm（+60℃） |
Refractive index as a function of wavelength
| The wavelength（nm） | Refractive index（n） | The wavelength（nm） | Refractive index（n） |
| 260 | 1.51 | 5140 | 1.45 |
| 300 | 1.50 | 6500 | 1.44 |
| 360 | 1.49 | 8000 | 1.43 |
| 480 | 1.48 | 8600 | 1.42 |
| 850 | 1.47 | 9200 | 1.41 |
| 3240 | 1.46 | 9800 | 1.40 |
