Oxotungstates of lanthanum and alkaline-earth elements as materials for neodymium powder lasers

An investigation was made of the spectra of oxotungstates Sr_2.95(Nd, Nb)_0.025WO₆ and MeLa₂WO₇:Nd (Me = Sr, Ba) prepared in the form of powders as a result of solid-phase synthesis. Powders of BaLa₂WO₇ exhibited stimulated emission of neodymium in the region of 1.07 μm at liquid nitrogen and helium temperatures, as demonstrated by a strong narrowing of the luminescence spectrum and a threshold. A characteristic "pedestal cutoff" dependent on the pump power was observed in the excitation spectra of the luminescence. A study of the luminescence and luminescence-excitation spectra of europium oxotungstates was carried out in order to obtain more detailed information on the structure of the luminescence centers.