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Title: Frequency non-degenerate sequential excitation of the impurity trapped exciton in strontium fluoride crystals doped with ytterbium

We model the dynamic behaviour observed for impurity-trapped excitons in SrF{sub 2}:Yb{sup 2+} using transient photoluminescence enhancement induced via a two-frequency, sequential excitation process employing an UV optical parametric amplifier synchronized to an IR free electron laser (FEL). We observe sharp transitions interpreted as a change of state of the localized hole and broad bands interpreted as a change of state of the delocalized electron. Our modeling indicates that the 4f crystal-field interaction is 25% smaller than in CaF{sub 2}. The photoluminescence enhancement transients are analyzed across a range of excitation frequencies using a system of rate equations. The temporal behavior is explained in terms of intra-excitonic relaxation, local lattice heating by the FEL, and liberation of electrons from trap states.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5] ;  [6]
  1. Department of Physics and Astronomy, University of Canterbury, PB 4800, Christchurch 8410 (New Zealand)
  2. The Dodd-Walls Centre for Photonic and Quantum Technologies and Department of Physics and Astronomy, University of Canterbury, PB 4800, Christchurch 8140 (New Zealand)
  3. MacDiarmid Institute for Advanced Materials and Nanotechnology and Department of Physics and Astronomy, University of Canterbury, PB 4800, Christchurch 8140 (New Zealand)
  4. Radboud University Nijmegen, Institute for Molecules and Materials, FELIX Facility, Toernooiveld 7, 6525 ED Nijmegen (Netherlands)
  5. (New Zealand)
  6. Debye Institute for NanoMaterials Science, University of Utrecht, P.O. Box 80000, TA 3508 Utrecht (Netherlands)
Publication Date:
OSTI Identifier:
22399376
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CALCIUM FLUORIDES; COMPUTERIZED SIMULATION; CRYSTAL FIELD; CRYSTALS; DOPED MATERIALS; ELECTRONS; EXCITATION; EXCITONS; FREE ELECTRON LASERS; HOLES; PARAMETRIC AMPLIFIERS; PHOTOLUMINESCENCE; RELAXATION; STRONTIUM FLUORIDES; TRANSIENTS; TRAPPING; TRAPS; YTTERBIUM; YTTERBIUM IONS