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CALCIUM FLUORIDE, CaF₂

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. Maximum available size: 320 mm Dia x 60 mm Thk.

Main Properties

Chemical Formula CaF2 Crystal Class Cubic, cleaves [111] plane Lattice Constant, Å 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]