A REVIEW OF ER:YB:YAB CRYSTAL

The nonradiative changeover rates Stick to the formula WNR = W (0) exp(-alphap), wherever p is the number of phonons matching the Strength gap. The nonradiative changeover fees of Er3+ show temperature dependence according to the multiphonon peace theory. In Tm3+ the temperature dependence of nonradiative peace fees is complex through the existence