SPECTROSCOPIC PROPERTIES OF NONSTOICHIOMETRIC MULTICOMPONENT FLUORIDE CRYSTALS WITH FLUORITE STRUCTURE DOPED WITH PR3+ IONS

摘要

Spectral studies of nonstoichiometric multicomponent fluoride crystals, doped with the Pr3+ ions, which have a CaF2-type partially disordered structure have shown that these crystals are promising candidates for amplifiers in the 1.3 mu m range. In Ba(1-x)R(x)F(2+x):Pr crystals the oscillator strengths of all transitions are markedly increased in comparison with those in BaF2 crystals due to the formation of centres with a low symmetry of their local environment. The concentration quenching of the luminescence in Ba1-xRxF2+x:Pr and Pb0.67Cd0.33F2:Pr crystals as well as the probability of nonradiative relaxation from the (1)G(4) state are smaller than those in glasses. [References: 14]