Фторид кальция CaF2

Optics-M produces lenses, windows, prisms, wedges, ball lenses, cylindrical lenses, windows for spectrophotometers and others optical components according to customers’ specifications and drawings out of crystals calcium fluoride CaF2. Calcium Fluoride has widespread IR application as spectroscopic CaF2 windows, CaF2 prisms and CaF2 lenses. Especially pure grades of Calcium Fluoride (CaF2) find useful application in the UV and as UV Excimer laser windows. Calcium Fluoride (CaF2) is available doped with Europium as a gamma-ray scintillator.

Calcium fluoride (CaF2 or fluorite) is grown by vacuum Stockbarger technique in diameters of up to about 250mm. Material for Infrared use is grown using naturally mined fluorite, in large quantities at a relatively low cost. For UV applications chemically prepared raw material is generally used. For Excimer applications, we use only the highest grade of specially selected material and crystal.

Product Data

Transmission Range 0.13 to 10 μm
Refractive Index 1.39908 at 5 μm (1) (2)
Reflection Loss 5.4% at 5 μm
Absorption Coefficient 7.8 x 10-4 cm-1 @ 2.7 μm
Reststrahlen Peak 35 μm
dn/dT -10.6 x 10-6/°C (3)
dn/dμ 0 : 1.7 μm
Density 3.18 g/cc
Melting Point 1360°C
Thermal Conductivity 9.71 W m-1 K-1 (4)
Thermal Expansion 18.85 x 10-6/°C (5)(6)
Hardness Knoop 158.3 (100) with 500g indenter
Specific Heat Capacity 854 J Kg-1 K-1
Dielectric Constant 6.76 at 1MHz (7)
Youngs Modulus (E) 75.8 GPa (7)
Shear Modulus (G) 33.77 GPa (7)
Bulk Modulus (K) 82.71 GPa (7)
Elastic Coefficients C11 = 164 C12 = 53 C44 = 33.7 (7)
Apparent Elastic Limit 36.54 MPa
Poisson Ratio 0.26
Solubility 0.0017g/100g water at 20°C
Molecular Weight 78.08
Class/Structure Cubic (111) cleavage

Transmittance

Refractive Index

No = Ordinary Ray

µm No µm No µm No
0.149 1.5800 0.161 1.5490 0.195 1.5000
0.200 1.4950 0.222 1.4800 0.248 1.4680
0.266 1.4621 0.280 1.4584 0.300 1.454
0.337 1.4481 0.400 1.4419 0.486 1.4370
0.588 1.4339 0.656 1.4325 0.687 1.4320
0.728 1.4314 0.884 1.4298 1.014 1.4256
1.100 1.4283 1.250 1.4275 1.650 1.4256
1.900 1.4244 2.058 1.4236 2.450 1.4214
2.700 1.4199 2.800 1.4192 3.050 1.4175
3.400 1.4149 4.000 1.4096 4.400 1.4057
4.800 1.4014 5.000 1.3991 5.304 1.3952
5.893 1.3871 6.483 1.3782 7.072 1.3681
7.661 1.357 8.251 1.3444 8.840 1.3308
9.429 1.3161