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  CAF2 CRYSTALS
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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.

Properties (CaF2)

 

Transmission Range  

0.13 - 9 µm  

Refractive Index 

1.501830 @0.193 µm; 1.40568 @4.4 µm  

Reflective Loss  

5,6% @4 µm  

Reststrahlen 

35 µm  

Density  

3.18 g/cm3  

Melting Point  

1418°C 

Molecular Weight  

78.08 

Thermal_Conductivity  

9.71 W/(m·K)

Specific Heat  

854 J/(kg·K)  

Thermal Expansion  

18.87 - 20.16 (·10-6 /°C (25°C)) 

Hardness (Mohs)  

158.3  

Mohshärte  

4  

Young`s Modulus  

75.8 GPa  

Shear Modulus  

33.77 GPa  

Bulk Modulus  

82.71 GPa  

Rupture Modulus  

36.5 MPa  

Elastic Coefficient  

C11 = 164; C12 = 53; C44 = 33.7 GPa  

Dielectric Constant  

6.76 @27°C f= 100kHz 

Solubility in Water  

0.0017 g/100g @20°C  

Type of Material  

Single crystal, synthetic  

Crystal Structure  

Cubic, CaF2 type structure, Fluoride or Fluorite type structure, Fm3m Oh5, a0= 5,4623 Å 

Cleavage Planes  

{111}  

Size of ingots 

max. 200 mm ø 

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.

Remarks  

Material specifications: 1. Measurements of transmission (VUV/UV-VIS/IR) 2. Homogenity of Refractive Index 3. Stress-induced birefringence 

 
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