ENERGY TRANSFER PROCESSES IN Yb3+- AND Tm3+-ION-DOPED OXIDE AND FLUORIDE CRYSTALS

Energy transfer characteristics from Yb3+ to Tm3+ ions have been investigated on five different oxide lattices as well as four fluoride lattices for the purpose of characterizing the host materials and of obtaining optimizing procedures for laser and display devices. The energy transfer coefficients of the oxide crystals are larger and more dependent upon the donor concentration than those of the fluoride lattices. Microscopic interaction parameters have been determined for the oxide as well as the fluoride lattices by comparing the experimental results with the results of computer simulation, assuming dipole-dipole (d-d) interaction between relevant ions. The d-d interaction parameters in the oxide host materials have different values for different materials. 14 refs.