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Details |
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CaF2 Crystals
Transmissible in the range from the vacuum ultraviolet region of 130nm to the infrared region of 9µm, the crystal finds use in windows, lenses and prisms operating from VUV to IR spectrum. 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.
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Properties (CaF2) |
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Transmission Range |
0.13 - 9 µm |
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Refractive Index |
1.501830 @0.193 µm; 1.40568 @4.4 µm |
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Reflective Loss |
5,6% @4 µm |
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Reststrahlen |
35 µm |
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Density |
3.18 g/cm3 |
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Melting Point |
1418°C |
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Molecular Weight |
78.08 |
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Thermal_Conductivity |
9.71 W/(m·K) |
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Specific Heat |
854 J/(kg·K) |
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Thermal Expansion |
18.87 - 20.16 (·10-6 /°C (25°C)) |
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Hardness (Mohs) |
158.3 |
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Mohshärte |
4 |
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Young`s Modulus |
75.8 GPa |
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Shear Modulus |
33.77 GPa |
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Bulk Modulus |
82.71 GPa |
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Rupture Modulus |
36.5 MPa |
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Elastic Coefficient |
C11 = 164; C12 = 53; C44 = 33.7 GPa |
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Dielectric Constant |
6.76 @27°C f= 100kHz |
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Solubility in Water |
0.0017 g/100g @20°C |
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Type of Material |
Single crystal, synthetic |
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Crystal Structure |
Cubic, CaF2 type structure, Fluoride or Fluorite type structure, Fm3m Oh5, a0= 5,4623 Å |
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Cleavage Planes |
{111} |
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Size of ingots |
max. 200 mm ø |
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Application |
The material is available in different quality levels (IR, UV, VUV-Laser-grade). Field of application is the IR analytic, astronomical- und camera lenses and optics for Excimer laser. |
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Remarks |
Material specifications: 1. Measurements of transmission (VUV/UV-VIS/IR) 2. Homogenity of Refractive Index 3. Stress-induced birefringence | |
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