NOT KNOWN DETAILS ABOUT ER:YB:YAB CRYSTAL

The nonradiative changeover prices Stick to the components WNR = W (0) exp(-alphap), wherever p is the amount of phonons matching the Vitality gap. The nonradiative transition rates of Er3+ show temperature dependence according to the multiphonon rest principle. In Tm3+ the temperature dependence of nonradiative peace rates is complex from the exis