Specifications:
| Materials | IR Grade Calcium Fluoride Crystals | Aperture | >90% |
| Dimension Tolerance | +0.0/-0.2mm | Thickness Tolerance | +/-0.1mm |
| Surface Quality | 60/40 S/D | Parallelism | 1 arc minute |
| Chamfer | 0.3-0.5mmx45degree | Coating | Optional protective coating |
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 |
Calcium Fluoride (CaF2 ) Windows, featuring high average transmission in the deep UV to near IR wavelength range (180 nm-8 µm), and low absorption coefficients, are competent for applications in the UV, Visual, and IR regions . CaF2 has a low chromatic aberration relative to other IR materials, therefore the material exhibits great imaging functionalities. Calcium Fluoride also has the advantages of high damage threshold, chemical resistance.Its Group Velocity Dispersion (GVD) is the lowest among the IR transmitters, therefore CaF2 is also recommendable for Femtosecond IR systems.
Hangzhou Shalom EO offers Calcium Fluoride Windows with protective coatings and assembled windows with metal holders. These products are requisite for spectroscopes or fluorescence imaging/ thermal imaging, the uncoated window substrates are excellent for excimer laser.
Curves:
Transmission curve of the CaF2 windows of different thickenss
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