NOT KNOWN FACTUAL STATEMENTS ABOUT ER:YB:YAB CRYSTAL

The nonradiative changeover fees follow the formulation WNR = W (0) exp(-alphap), wherever p is the volume of phonons matching the energy hole. The nonradiative changeover costs of Er3+ show temperature dependence consistent with the multiphonon relaxation theory. In Tm3+ the temperature dependence of nonradiative peace fees is complex through the