Dependence of the Er2O3 selective emission on the intensity of laser thermal excitation

The dependence of the selective emission (SE) spectra of erbium oxide (Er2O3) in the visible and near-IR spectral ranges on the laser excitation intensity at a wavelength of 10.6 μ m is experimentally studied. The intensity ratio for the Er3+ electronic and vibronic transitions in the SE spectra is varied with an increase in the laser intensity to 10 kW/cm2. The mechanism for the multiphonon fluctuation excitation of electronic states and a possibility for the SE application in the observation of the thermo-photo-laser effect are discussed.