Optical spectroscopy of octahedral impurity Yb3+ ions in a CsCaF3 crystal

Optical spectra of a CsCaF3 crystal doped with Yb3+ ions are experimentally separated into groups of lines corresponding to different impurity centers formed by the Yb3+ ions introduced to sites with the hexagonal and dodecah edral environment of ligands. In the spectra of octahedral centers, the lin es related to the cubic and trigonal centers are identified. The empirical energy level diagrams are constructed for impurity centers of both types, f rom which parameters of the relevant crystal fields are found.