Investigation of nonradiative losses and pulse-periodic stimulated emission from Li–Nd–La phosphate glass

An investigation was made of the concentration dependences of the decay kinetics, nonradiative deactivation probability, and absolute quantum efficiency of the luminescence from the ⁴F_3/2 upper laser level of Nd³⁺ in Li–Nd_x–La_1–x, phosphate glasses. The quenching of the luminescence from the ⁴F_3/2 level of Nd³⁺ in these Li–Nd_x–La_1–x phosphate glasses was much weaker than in the majority of the known laser matrices. A flashlamp-pumped sample of Li–Nd_0.2–La_0.8 emitted stimulated emission at a pulse repetition frequency up to 50 Hz.