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CaF2 is a cubic single crystal. It has good transmission from UV to middle infrared wavelength. It is always used in excimer laser components. While, it is a little hygroscopic and susceptible to thermal shock.
CaF2 

Transmission Range: 170nm~7800nm

Thermal Expansion Coefficient: 18.85 x 10-6/K (20℃ to 60℃)

Density: 3.18 g/cm3

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