Abstract
The interaction between local modes (ωL— vibrations associated to an impurity ion) and phonon modes (ωP—vibrations associated to the lattice host) plays a crucial role in determining the strength of nonradiative processes taking place in impurity-doped laser crystals. Following photoexcitation of an impurity ion, nonradiative processes proceed through the following succession of steps: (1) a transition through an electronic bottleneck (towards a lower lying electronic state) generates a large local mode population; (2) the energy stored for a brief time (~ps) in local modes is transferred to select phonon modes via harmonic and/or anharmonic interactions; and; (3) the "active" phonon modes interact with the phonon bath and bring the system back to thermal equilibrium.
© 1999 Optical Society of America
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