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The optical spectroscopy of the new material for IR tunable laser applications MgAl2O4 : Ni2+ is presented. A comparison with well-known fluoride materials is made for IR fluorescent lifetimes and quantum efficiencies. For Ni2+ and Co2+ doped fluorides, limitations of concentrations in doping ions are established. Multiphonon processes are studied with a single frequency model and a good agreement is found. It is shown that the "effective phonon frequency" is closer to mean frequency of the density of states curves than to their maximum and the electron-phonon coupling factors appears to vary with doping concentration

MATERIALS FOR IR TUNABLE LASER APPLICATIONS AND NON RADIATIVE DECAY PROCESSES