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Calcium Fluoride crystal
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For optical windows, lenses and prisms in the 0.15 μm - 9 μm ranges for cameras, photolithography and IR spectroscopy.

CaF2 is used It shows good thermal-mechanical properties. It is widely used for optical windows, lenses and prisms in the 0.15 μm - 9 μm ranges for cameras, photolithography and IR spectroscopy. For its low absorption and low refractive index CaF2 has found wide application in high power laser optics and can be used without anti-reflection coating.

 

Calcium fluoride (CaF2) crystal: The calcium fluoride single crystal's most large diameter is 300mm; the greatest length is 200mm.Develops the ultraviolet level calcium fluoride single crystal. It still had 90% transmission at 190nm.

 

 

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]

 
 
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