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.
Absorption and emission spectra of Yb3+ in yttria-stabilized cubic zirconia were studied. Selective emission spectra of Yb3+ in crystal ZrO2-O,3% Yb2O3 12% Y2O3 at wavelength scanning the exciting light in the absorption band range were registered. Emission spectra of Yb3+ with 3 ms and 5 μs time-delay relation to excited pulse were also obtained for the crystal. The results of the carried out experiments are discussed within assumption frame of existing three basis types of optical centers.
Glasses based on the lanthanum borate (La2O3 • 3 B2O3) with total rare-earth concentration up to 40 mol.% were sintered. Spectroscopic properties of glasses (Yb+3 concentration 1-15 at. %) were investigated. Absorption and fluorescence spectra as well as fluorescence decay kinetics for all compositions had been measured.