"Ettore Majorana" Foundation and Centre for Scientific Culture and International School of Atomic and Molecular Spectroscopy
Abstract
Inhomogeneous active-ion distributions in laser materials lead to strong deviations of upconversion versus direct luminescence transients from the quadratic law of energy-transfer upconversion. Measured luminescence decay curves in LaSc3β(BO3β)4β:Nd3+ and GdVO4β:Nd3+ confirm experimentally the predicted deviations. Differences in energy migration within the metastable level of Nd3+ are indentified