Abstract
We have correlated the radiative fluorescence lifetime of the 4 F 3 2 level of Nd 3+ in laser crystals, including the recently developed high-Nd-concentration materials such as NdP 5O 14, with the local Nd 3+ site symmetry. At Nd 3+ concentrations low enough for non-radiative interactions to be negligible, the fluorescence decay rate is determined by the deviation from local inversion symmetry, which admixes even- and odd-parity electronic wavefunctions, allowing 4 F 3 2 radiative decay by electric-dipole transitions.
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