NOT KNOWN DETAILS ABOUT ER:YB:YAB CRYSTAL

The nonradiative transition costs follow the components WNR = W (0) exp(-alphap), in which p is the volume of phonons matching the Vitality hole. The nonradiative transition costs of Er3+ exhibit temperature dependence consistent with the multiphonon rest principle. In Tm3+ the temperature dependence of nonradiative relaxation charges is sophistica