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Calcium Fluoride (CaF2) Windows
●  UV to IR wavelength range  0.18-8 μm 
●  Excellent as the sercurity inspection windows
Due to its high average transmission and low chromatic aberration relative to other IR materials, calcium fluoride(CaF2 ) is an excellent choice for windows and lenses for spectroscopy applications in the deep UV to near IR wavelength range (180 nm-8 µm). For its good transmission properties at LWIR range, the CaF2 are often selected as the windows for thermal imaging security inspections in electric power facilities and petroleum industries. A protective coated could be made on the windows surface to improve its deliquescence properties.