Half Ball Lens CaF2 is a precision optical element made by processing calcium fluoride crystals into a hemispherical geometry. The material provides excellent transmission from ultraviolet to mid-infrared wavelengths with very low dispersion and birefringence. Its half-ball structure allows optimized coupling efficiency and controlled light distribution in optical systems. These components are produced through high-precision slicing and polishing techniques to ensure accurate curvature and surface quality. They are commonly used in fiber coupling, spectroscopy, laser optics, and biomedical imaging systems.