Nonradiative relaxation and inhomogeneous splitting of aggregated optical centers in the Nd3+-doped CaF2 and SrF2 crystals (FLN and decay study)

Academic Article

Abstract

  • Site-selective fluorescence and laser excitation spectroscopy for different types of optical centers in SrF2 : Nd3+ (0.3 - 1.0%) and SrF2 : La3+ (1.0%) : Nd3+ (0.2%) were performed at 4.2 K. The crystal-field levels of the 4I9/2, 4F3/2 , and 4G5/2 multiplets for different Nd3+ optical centers were determined in SrF2 : Nd3+ (0.3%). An attempt was made to identify some of the new optical centers on the basis of their fluorescence lifetimes and crystal-field splitting. Some models of these centers have been discussed. Two-six times reduction of the 4P3/2 multiplet lifetime was observed in the pair M-center in comparison with the single optical centers due to energy cross-relaxation in the pair. A fine splitting of the levels at the 4I9/2(1) → 4G5/2(1) crystal-field transition (1.5 cm-1) similar to that in CaF2 (2.4 cm-1) was found for the Nd-Nd pair in SrF2. The variation of the splitting from CaF2 to SrF2 nicely demonstrates the R-5 dependence of coherent quadrupole-quadrupole interaction. © 1999 Elsevier Science B.V. All rights reserved.
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    Digital Object Identifier (doi)

    Author List

  • Orlovskii YV; Fedorov VV; Basiev TT; Altwein M; Leu B; Heber J; Mirov S
  • Start Page

  • 361
  • End Page

  • 366
  • Volume

  • 83-84