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 Calcium fluoride is a superb optical material. It is often chosen by laser optics manufacturers for its wide transmission range, low absorption and low refraction. Compared to other fluorides, CaF2 is much more resistant to moisture and to thermal shock. CaF2 optics are commonly used in imaging, thermal imaging, astronomy, microlithography and high-power lasers. |
| Syngony | Cubic | | Symmetry class | M3m | | Lattice constants | A=5.462 c=a | | Cleavability | (111) | | Refractive index at Nd | 1.4349 | | Refractive index at Nf -Nc | 0.0043 | | Refractive index at N10.6 | 1.2996 | | Reflection loss | 5.5 % | | Transmission range | 0.15-9 μm | | Density | 3.18 g/ cm3 | | Melting point | 1360 ° С | | Thermal conductivity index | 9.71 Вт/(м K) | | Thermal expansion index | 18.5 x 10-6/К | | Knoop hardness | 158.3 kg/mm2 (100) | | Specific heat | 854 J/(kg K) | | Dielectric constant (f=1 MHz) | 6.76 | | Young’s Modulus, E | 75.8 GPa | | Shear modulus, G | 33.77 GPa | | Modulus of volume elasticity, K | 82.71 GPa | | Elastic strength | 36.54 MPa | | Poissont ratio | 0.26 | | Solubility | 0.0017 g / 100 g of water at T= 20 °C | | Molecular weight | 78.08 |
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CaF2 Transmission
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| λ, μm | Refractive index | | 0.19 | 1.51 | | 0.21 | 1.49 | | 0.25 | 1.47 | | 0.33 | 1.45 | | 0.41 | 1.44 | | 0.88 | 1.43 | | 2.65 | 1.42 | | 3.90 | 1.41 | | 5.00 | 1.40 | | 6.20 | 1.38 | | 7.00 | 1.36 | | 8.22 | 1.34 |
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| CaF2 blanks and windows for IR applications |
| Diameter/Width | 12.7-101.6 +/-0.2 mm | | Thickness/length | 2-12 +/-0.2 mm | | Surface quality | As-cut, 80/50, 60/40 per MIL-0-13830 | | Wedge | < 5’ | | Clear aperture | 90% |
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CaF2 optical prisms for IR applications
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| Length/Width | 7-25.4 +/-0.1 mm | | Thickness/length | 7-25.4 +/-0.1 mm | | Surface quality | 80/50, 60/40 per MIL-0-13830 | | Corner tolerance | +/-10’’ | | Total surface error | λ / 2 |
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CaF2 optical wedges for IR applications |
| Diameter/Width | 12.7-101.6 +/-0.2 mm | | Thickness/length | 2-10 +/-0.1 mm | | Surface quality | 80/50, 60/40 per MIL-0-13830 | | Wedge tolerance | +/- 3’ | | Total surface error | λ / 2 | | Clear aperture | 90% |
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