Calcium Fluoride (CaF2)

	Calcium Fluoride (CaF2) MSDS
	Calcium Fluoride (CaF2) Data Sheet
	Calcium Fluoride (CaF2) Guide

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.

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

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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	1.4288
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

Product Notes

Calcium fluoride (CaF₂or 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.

REFERENCES:
(1) Handbook Optical Constants, ed Palik, V2, ISBN 0-12-544422-2
(2) Dressler et al., Cryst.Res.Technol. V27, p413, 1992
(3) I.H.Malitson; J.Opt.Soc.Am. Vol52, p1377, 1962
(4) Ballard et al; Rev. Sci. Instr., V21, p905, 1950
(5) Batchelder & Simmons, J.Chem. Phys. V41, p2324 N8 1964
(6) Schumann & Neumann, Crys. Res. Tech V19, 1984
(7) Dickinson, IR laser windows, AFCRL-TR-0318, Air Force, Cambridge 1975

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Data provided is extracted from our technical handbook of materials. While every attempt has been made to verify the source of the information, Crystran Ltd accept no responsibility for accuracy of data

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