Abstract
We present a detailed investigation of the dynamics of impurity-trapped excitons in CaF2:Yb2+ using transient photoluminescence enhancement induced via a two-frequency, sequential excitation process employing a UV optical parametric amplifier (OPA) synchronized to an infrared free electron laser (FEL). The temporal behaviour is well approximated by a multi-level rate equation model as relaxation between excited states of the exciton as well as a small contribution from local lattice heating by the FEL which becomes evident due to the 40cm−1 splitting of the exciton excited states giving rise to the transient photoluminescence enhancement itself.
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