A REVIEW OF ER:YB:YAB CRYSTAL

The nonradiative changeover prices follow the formula WNR = W (0) exp(-alphap), in which p is the number of phonons matching the Power gap. The nonradiative changeover costs of Er3+ show temperature dependence in step with the multiphonon rest principle. In Tm3+ the temperature dependence of nonradiative rest rates is complex with the existence of