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.

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]