The results of spectroscopy of disordered Er-doped calcium-niobium- gallium garnets (CNGG: Er) are displayed.
Based on the Judd-Ofelt theory, three intensity parameters Ωt (t=2, 4, 6) for Er ions concentration from 6 at. % in these
crystals were obtained. The oscillator strength for hypersensitivity transition 4I15/2→2H11/2 and intensity parameter Ω2 of
Er3+ ions in CNGG: Er crystals are higher than corresponding values for other Er-doped garnets. These results we
explain by the presence in these crystals of optical centers Er with the environment symmetry lower than D2. Gain crosssection
for laser transition 4I13/2 → 4I15/2 of Er3+ ions was obtained using absorption and emission cross-data for transition
4I15/2 → 4I13/2 and 4I13/2 → 4I15/2 respectively.
The results of spectroscopy of disordered Tm-doped calcium-niobium- gallium garnets (CNGG) are displayed. Based on
the Judd-Ofelt theory, three intensity parameters were obtained. Gain cross-section for laser transition 3F4→3H6 of Tm3+
ions was obtained using absorption and emission cross-data for transition 3H6→3F4 and 3F4→3H6 respectively. The laser
emission is reported in Tm:CNGG (transition 3F4→3H6) at room temperature with laser diode pumping.
In the work, the results of the investigations of processes of non radiative energy transfer between ions Yb3+
and Trn3+ in silica-alumina fibers are presented. It was discovered that the interaction between ions Yb3+ and Tm3+ is
described within the framework of the Ferster's law for the case of dipole-dipole interaction mechanism. The
microparameter of interaction CdaY rightwards arrow Tm is 1.56 · 10-39 cm6sec-1.
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