Modelling of decay kinetics of self-trapped exciton luminescence in CdWO4 under femtosecond laser excitation in absorption saturation conditions

Sergey Markov, Vitali Nagirnyi 1 , Andrey Vasil’ev 3 , Vladimir Makhov 2 , Raul Laasner 1 , Sebastian Vielhauer 1 , Marco Kirm 1 , Rimantas Grigonis 4 , and Valdas Sirutkaitis 4
  • 1 Institute of Physics, University of Tartu, Tartu, Estonia
  • 2 P.N. Lebedev Physical Institute, Moscow, Russia
  • 3 Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
  • 4 Laser Research Centre of Vilnius University, Vilnius, Lithuania

Abstract

The analytical expressions for the three-dimensional spatial distribution of excitons and luminescence decay kinetics of wide band-gap crystals were derived taking into account the saturation effect for absorption near the centre of the incident laser beam with Gaussian transversal profile. The model is verified for the excitonic emission of CdWO4 crystals under excitation by ultra-short laser pulses in the region of weak excitonic absorption.

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