EXAMINE THIS REPORT ON ER:YB:YAB CRYSTAL

The nonradiative transition fees follow the system WNR = W (0) exp(-alphap), the place p is the number of phonons matching the energy gap. The nonradiative changeover charges of Er3+ show temperature dependence per the multiphonon relaxation theory. In Tm3+ the temperature dependence of nonradiative peace charges is complicated through the existenc