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Calcium Fluoride has appropriate refractive index variations for wavelengths and transmission to wavelengths from vacuum ultraviolet 125nm to infrared 12um . It can be used as a prism, lens or window within a wide region from ultraviolet to infrared.Also,since it has unique optical dispersion(Abbe's number:95),it can be used as an achromatic lens (Apocromat) combined with other optical materials. It can also be used as a laser crystal or radiation detection crystal by doping it with the appropriate rare earth elements.
Material Properties:
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Infrared Optics