CaF2 Crystal

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. 

Maximum available size: 380 mm Dia x 70 mm Thk 


                    

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, μm
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, μm
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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