Detailed spectroscopic investigations are made for cubic (O h10–Ia3d) Nd3+ doped Y3Ga5O12 and YGaO3 garnet crystals, formed in the physico‐chemical Y2O3‐Ga2O3 system with sesquoxide relations 3:5 and 1:1. As result of absorption and luminescence spectra analysis, the Stark splittings of the lowest 4F3/2 and 4I9/2‐15/2 manifolds of the Nd3+ ions are determined with high accuracy. This allows to make reliable identification of induced transitions measured before in Y3Ga5O12–Nd3+ crystals. Some spectroscopic characteristics of the Nd3+ ions in Y3Ga5O12 and YGaO3 crystals, such as luminescent lifetime of the metastable state, intermanifold and “Stark” luminescence branching ratios, linewidths, luminescence quantum efficiency, as well as peak cross‐sections and spontaneous transition probabilities are also determined. These characteristics are necessary for a theoretical description of the functional properties of lasers based on the above mentioned media.
A theoretical consideration is made of the thermal broadening and shift of the impurity energy levels in crystals doped with TR3+ ions using the Hamiltonian of electron-phonon interaction containing linear terms in the lattice variables. I n the method developed for the calculation of these effects the real phonon density distribution is used for the host crystal. The information about this distribution is obtained from the spectrum of vibrational satellites of zero-phonon lines. The calculations are carried out for the thermal broadening and the shift of some lines in the 4F3/2 + 411112 luminescence band of the Nd3+ ion in an YAlO, host crystal.l) The same model was used in [7] for calculations of the parameters of the theory [l] for the R-lines of ruby.
Yu. E. PERLIX et al. : Eonradiative Jhltiphonon Relaxation in Y3A1,0,,: Nd3+ phys. stat. sol. (b) 92, 403 (1979) Subject classification: 13.4 and 20.3; 6; 22.8 VYLEGZHANIN (b) Analytical expressions are derived for the multiphonon decay rate of an isolated impurity level, when interaction with low-frequency phonons appears as small perturbation. Both, the interaction with high-frequency optical phonons and the contribution of Jahn-Teller vibrations are taken into account in the framework of first cumulant approximation. In the temperature range 0 to 700 K the transition probability 4111jr -* * l y p of the states of Nd3+ ions in Y3A41j0,3 crystals are ralculated numerically. The results are in agreement with data obtained from laser generation kinetics.
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