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Material CaF2 (Calcium Fluoride)
Calcium Fluoride is used for optical windows, lenses and prisms in the 0.15 µm - 9 µm range.
This material has found wide use in high power laser optics
due to its low absorption. Polished surfaces are stable and
will last several years under normal conditions. Due to its
low refractive index, Calcium Fluoride can be used without anti-reflection
coating. Calcium fluoride is grown by vacuum Stockbarger technique.
Material for IR use is grown using naturally mined fluorite,
in large quantities at relatively low cost.
BASE PROPERTIES
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PARAMETER |
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VALUE |
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| OPTICAL |
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Transmission Range |
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0.13 to 10 microns |
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Refractive Index |
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1.39908 at 5 microns |
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Reflection Loss |
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5.5% at 5 µm (2 surfaces) |
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dn/dT |
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-10.6 x 10-6/°C |
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| PHYSICAL |
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Density |
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3.18 g/cm3 |
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Melting Point |
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1360 ° С |
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Thermal Conductivity |
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9.71 W/(m*K) |
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Thermal Expansion |
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18.5 x 10-6/°C |
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Hardness |
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158.3 kg/mm2 (100) |
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Specific Heat Capacity |
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854J/(kg K) |
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Dielectric Constant |
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6.76 |
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Young's Modulus (E) |
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75.8 GPa |
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Shear Modulus (G) |
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33.77 GPa |
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Bulk Modulus (K) |
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82.71 GPa |
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Elastic Coefficients |
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C11=164 MPa, C12=53
MPa,
C44=33.7 MPa |
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Apparent Elastic Limit |
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36.54 MPa |
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Poisson Ratio |
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0.26 |
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| CHEMICAL |
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Solubility |
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0.0017g/100g water at 20 °C |
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Molecular Weight |
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78.08 |
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Class/Structure |
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Cubic (111) cleavage |
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REFRACTIVE INDEX
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Wavelength, µm |
0.19 |
0.21 |
0.25 |
0.33 |
0.41 |
0.88 |
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Refractive Index |
1.51 |
1.49 |
1.47 |
1.45 |
1.44 |
1.43 |
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Wavelength, µm |
2.65 |
3.90 |
5.00 |
6.20 |
7.00 |
8.22 |
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Refractive Index |
1.42 |
1.41 |
1.40 |
1.38 |
1.36 |
1.34 |
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Delivery
Maximum available size: 380 mm Dia x 70 mm Thk
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