Hellma Materials CaF2 has been utilized as an optical key material in microlithography for semiconductor production for many years.
CaF2 is established as an industry standard material for excimer laser optics in projection and illumination optics.
The unique optical properties of CaF2 enable a variety of advanced applications.

calcium fluoride lens is an excellent material for ultraviolet to near infrared wavelengths (180-8000 nm). Compared with various infrared materials, it has higher average transmittance and lower color difference. In the near-infrared range, its GVD is very low, so it is very suitable for some applications that need to use femtosecond infrared pulse.