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

Yamaga, M and Hayashi, E and Kodama, N and Itoh, K and Yabashi, S and Masui, Y and Ono, S and Sarukura, N and Han, T P J and Gallagher, Hugh Gerald (2006) Vacuum ultraviolet spectroscopy of Ce3+-doped SrMgF4 with superlattice structure. Journal of Physics: Condensed Matter, 18 (26). pp. 6033-6044. ISSN 0953-8984

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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.