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 40 cm−1splitting of the exciton excited states giving rise to the transient photoluminescence enhancement itself.
Original language | English |
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Pages (from-to) | 608-615 |
Number of pages | 8 |
Journal | Journal of Luminescence |
Volume | 192 |
DOIs | |
Publication status | Published - 1 Dec 2017 |