Spectroscopic properties and 3 μm stimulated emission of Er3+ ions in the (Y1−xErx)3Al5O12 and (Lu1−xEr3)3Al5O12 garnet crystal systems

Abstract

Detailed spectral physical investigations of the (Y1-xErx)Al5O12 and (Lu1−xEr3)3Al5O12 garnet systems in a wide Er3+ ion concentration range (x = 0.003 to 1) is carried out. The calculation of the ωt intensity parameters in terms of the induced electric dipole transition theory is completed, and the influence of the data on hypersensitive transitions, as well, as the role of the TR3+ ion wavefunction choice to the results of said calculation is discussed. The estimation of the contribu-tion, stipulated by the induced oscillating dipole moments of the ligands in the value of the ω2 parameter is carried out. Intermanifold luminescence branching ratios for all initial laser states of the Er3+ ions connected with the stimulated emission process are calculated. The possibility of using the concept of “spectroscopic quality” of an activated medium in the case when the intensity parameter ω2 ≠ 0 is discussed. The precise measurements of 3 μm stimulated emission spectral composition at ∼ 110 and 300 K are carried out. The energy of the Stark levels of the 4I11/2 and 4I13/2 manifolds is defined. All 3 μm induced transitions are identified and the laser kinetics at their wavelengths is studied. [Russian Text Ignored].