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| Materials>Crystals>>CaF2 Crystal | |||||||||||||||
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CaF2 Crystal Calcium Fluoride is used for optical windows, lenses and prisms in the 0.15 m - 9 m 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 Stockbroker technique. Material for IR use is grown using naturally mined fluorite, in large quantities at relatively low cost. Maximum available size: 380 mm Dia x 70 mm Thk |
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Calcium Fluoride (CaF2)  |
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BASE PROPERTIES |
PARAMETER |
VALUE |
OPTICAL |
|
Transmission Range |
0.13 to 10 microns |
Refractive Index |
1.39908 at 5 microns |
Reflection Loss |
5.4% at 5 microns (2 surfaces) |
Restrahlen Peak |
35 microns |
dN/dT |
-10.6 x 10-6e/C |
PHYSICAL |
|
Density |
3.18 g/cm3 |
Melting Point |
1360 C |
Thermal Conductivity |
9.71 W/(m*K) |
Thermal Expansion |
18.85 x 10-6e/C |
Hardness |
Knoop 158.3 kg/mm2 (100) |
Specific Heat Capacity |
854J/(kg K) |
Dielectric Constant |
6.76 at 1MHz |
Young's Modulus (E) |
75.8 GPa |
Shear Modulus (G) |
33.77 GPa |
Bulk Modulus (K) |
82.71 GPa |
Elastic Coefficients |
C11=164 MPa, C12=53 MPa, C44=33.7 MPa |
Apparent Elastic Limit |
36.54 MPa |
Poisson Ratio |
0.26 |
CHEMICAL |
|
Solubility |
0.0017g/100g water at 20 C |
Molecular Weight |
78.08 |
Class/Structure |
Cubic (111) cleavage |
| REFRACTIVE INDEX | ||||||
Wavelength,
m |
0.19 |
0.21 |
0.25 |
0.33 |
0.41 |
0.88 |
Refractive
Index |
1.51 |
1.49 |
1.47 |
1.45 |
1.44 |
1.43 |
Wavelength,
m |
2.65 |
3.90 |
5.00 |
6.20 |
7.00 |
8.22 |
Refractive
Index |
1.42 |
1.41 |
1.40 |
1.38 |
1.36 |
1.34 |
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