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T. I. BUTAEVA (b), V. A. FEDOROV (a), and S. E. SARKISOV (a) Detailed spectral physical investigations of the (Y1-zErz)&15012 and (Lul -ZErs)&16012 garnet systems in a wide Era+ ion concentration range (z = 0.003 to 1) is carried out. The calculation of the Qt 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 TRa+ ion wavefunction choice to the results of said calculation is discussed. The estimation of the contribution, stipulated by the induced oscillating dipole moments of the ligands in the value of the B, parameter is carried out. Intermanifold luminescence branching ratios for all initial laser states of the ErS+ 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 P, =)= 0 is discussed. The precise measurements of 3 pm stimulated emission spectral composition a t e 110 and 300 K are carried out. The energy of the Stark levels of the 4111/2 and *I1312 manifolds is defined. All 3 pm induced transitions are identified and the laser kinetics at their wavelengths is studied.

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