LITTLE KNOWN FACTS ABOUT ER:YB:YAB CRYSTAL.

The nonradiative transition charges follow the components WNR = W (0) exp(-alphap), where by p is the number of phonons matching the Power hole. The nonradiative changeover costs of Er3+ exhibit temperature dependence per the multiphonon relaxation principle. In Tm3+ the temperature dependence of nonradiative rest charges is difficult through the e