Almaz Optics, Inc.
12 Chadsford Ct.  Marlton, NJ 08053, USA
Tel:  856 797-0491, Fax: 856 797-0228
e-mail: mail@almazoptics.com

 

































CALCIUM FLUORIDE, CaF2

Calcium Fluoride is used for optical windows, lenses and prisms in the 0.15 m - 9 m 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. Maximum available size: 320 mm Dia x 60 mm Thk.


Sample thickness 10 mm


Main Properties

Chemical Formula CaF2
Crystal Class Cubic, cleaves [111] plane
Lattice Constant, 5.46
Density, g/cm3 (20 C) 3.18
Molecular Weight 78.08
Dielectric Constant for 105 Hz 6.76
Melting Temperature, K 1630
Thermal Conductivity, W/(m K) at 273 K 10
Thermal Expansion, 1/K at 300 K 18.9 x 10-6
Specific Heat, cal/(g K) at 273 K 0.204
Debye Temperature, K 510
Young's Modulus, GPa 75.79
Rupture Modulus, GPa 0.0365
Shear Modulus, GPa 33.76
Bulk Modulus, GPa 83.03
Poisson's Ratio 0.28
Knoop Hardness, kg/mm2 178 [100], 160 [110]

Refractive Index

Wavelength, m 0.19 0.21 0.25 0.33 0.41 0.88 2.65 3.90 5.00 6.20 7.00 8.22
Refractive Index 1.51 1.49 1.47 1.45 1.44 1.43 1.42 1.41 1.40 1.38 1.36 1.34