CaF2 (Calcium Fluoride)
Calcium Fluoride has widespread IR application as spectroscopic CaF2 windows, CaF2 prisms and CaF2 lenses. Especially pure grades of Calcium Fluoride (CaF2) find useful application in the UV and as UV Excimer laser windows. Calcium Fluoride (CaF2) is available doped with Europium as a gamma-ray scintillator.
Physical and optical properties
| Transmission Range : | 0.13 to 10 μm |
| Refractive Index : | 1.39908 at 5 μm (1) (2) |
| Reflection Loss : | 5.4% at 5 μm |
| Absorption Coefficient : | 7.8 x 10-4 cm-1 @ 2.7 μm |
| Reststrahlen Peak : | 35 μm |
| dn/dT : | -10.6 x 10-6/°C (3) |
| dn/dμ = 0 : | 1.7 μm |
| Density : | 3.18 g/cc |
| Melting Point : | 1360°C |
| Thermal Conductivity : | 9.71 W m-1 K-1 (4) |
| Thermal Expansion : | 18.85 x 10-6/°C (5)(6) |
| Hardness : | Knoop 158.3 (100) with 500g indenter |
| Specific Heat Capacity : | 854 J Kg-1 K-1 |
| Dielectric Constant : | 6.76 at 1MHz (7) |
| Youngs Modulus (E) : | 75.8 GPa (7) |
| Shear Modulus (G) : | 33.77 GPa (7) |
| Bulk Modulus (K) : | 82.71 GPa (7) |
| Elastic Coefficients : | C11 = 164 C12 = 53 C44 = 33.7 (7) |
| Apparent Elastic Limit : | 36.54 MPa |
| Poisson Ratio : | 0.26 |
| Solubility : | 0.0017g/100g water at 20°C |
| Molecular Weight : | 78.08 |
| Class/Structure : | Cubic (111) cleavage |
Refractive Index
No = Ordinary Ray
| µm | No | µm | No | µm | No |
| 0.149 | 1.5800 | 0.161 | 1.5490 | 0.195 | 1.5000 |
| 0.200 | 1.4950 | 0.222 | 1.4800 | 0.248 | 1.4680 |
| 0.266 | 1.4621 | 0.280 | 1.4584 | 0.300 | 1.454 |
| 0.337 | 1.4481 | 0.400 | 1.4419 | 0.486 | 1.4370 |
| 0.588 | 1.4339 | 0.656 | 1.4325 | 0.687 | 1.4320 |
| 0.728 | 1.4314 | 0.884 | 1.4298 | 1.014 | 1.4288 |
| 1.100 | 1.4283 | 1.250 | 1.4275 | 1.650 | 1.4256 |
| 1.900 | 1.4244 | 2.058 | 1.4236 | 2.450 | 1.4214 |
| 2.700 | 1.4199 | 2.800 | 1.4192 | 3.050 | 1.4175 |
| 3.400 | 1.4149 | 4.000 | 1.4096 | 4.400 | 1.4057 |
| 4.800 | 1.4014 | 5.000 | 1.3991 | 5.304 | 1.3952 |
| 5.893 | 1.3871 | 6.483 | 1.3782 | 7.072 | 1.3681 |
| 7.661 | 1.357 | 8.251 | 1.3444 | 8.840 | 1.3308 |
| 9.429 | 1.3161 |
Product Notes
Calcium fluoride (CaF2 or fluorite) is grown by vacuum Stockbarger technique in diameters of up to about 250mm. Material for Infrared use is grown using naturally mined fluorite, in large quantities at a relatively low cost. For UV applications chemically prepared raw material is generally used. For Excimer applications, we use only the highest grade of specially selected material and crystal.
Tags: CaF2 (Calcium Fluoride)