A SIMPLE KEY FOR ER:YB:YAB CRYSTAL UNVEILED

The nonradiative changeover rates follow the components WNR = W (0) exp(-alphap), where p is the number of phonons matching the Vitality gap. The nonradiative changeover premiums of Er3+ show temperature dependence according to the multiphonon relaxation idea. In Tm3+ the temperature dependence of nonradiative leisure charges is difficult from the