Vacuum ultraviolet spectroscopy of Ce3+-doped SrMgF4 with superlattice structure

M Yamaga, E Hayashi, N Kodama, K Itoh, S Yabashi, Y Masui, S Ono, N Sarukura, T P J Han, Hugh Gerald Gallagher

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12 Citations (Scopus)

Abstract

X-ray diffraction of Ce3+-doped SrMgF4 (SMF:Ce) crystals shows a superlattice structure, reflecting the distribution of Ce3+ polyhedra centres observed in optical experiments. Optical absorption bands and fluorescence bands from the Ce3+ polyhedra centres overlap in the vacuum ultraviolet (VUV) and ultraviolet (UV) regions, respectively, so that wide pumping and tuning ranges are expected for laser operation. The SMF: Ce crystals, as well as the isomorphous BaMgF4, are candidates for a tunable laser gain material with nonlinear properties. The optical absorption, excitation, and fluorescence bands observed in the SMF: Ce crystals at low temperatures are ascribed to five distinct fluorescent centres. Three centres have well-known Ce3+ optical characters, for example, fluorescence with double peaks separated by 2000 cm(-1) and five resolved absorption/excitation bands. These centres are assigned to Ce3+-polyhedra classified by weak and strong crystal fields as a consequence of the superlattice structure. The other two fluorescence bands observed in the visible region have 1.5-2 times larger linewidths than those of the former three bands. These bands are interpreted as optical transitions from complexes consisting of Ce3+ and one or two electrons trapped at a vacancy of the nearest neighbour F-ligand ions.

Original languageEnglish
Pages (from-to)6033-6044
Number of pages12
JournalJournal of Physics: Condensed Matter
Volume18
Issue number26
DOIs
Publication statusPublished - 5 Jul 2006

Keywords

  • photochromic centers
  • crystals
  • fluoride
  • lasers
  • irradiation

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    Yamaga, M., Hayashi, E., Kodama, N., Itoh, K., Yabashi, S., Masui, Y., Ono, S., Sarukura, N., Han, T. P. J., & Gallagher, H. G. (2006). Vacuum ultraviolet spectroscopy of Ce3+-doped SrMgF4 with superlattice structure. Journal of Physics: Condensed Matter, 18(26), 6033-6044. https://doi.org/10.1088/0953-8984/18/26/021