The optical and generation characteristics of 8.3(3) at. % Yb:YSAG ceramics (Y2,55Yb0,25Sc1,00Al4,2O12) made by solid solution powder sintering. Lasing was obtained on the basis of Yb:YSAG ceramics and the characteristics of laser radiation were studied at different transmittances of the output mirror of the resonator. The maximum generation power was 1.8 W at 3.6 W of absorbed pumping in the quasi-cw generation mode. The maximum differential efficiency was 57% for a mirror with a transmittance of 14.5%.

The thulium-doped yttrium scandate crystal fiber has been obtained by the laser-heated pedestal growth method. The crystal belongs to the bixbyite type, has a cubic structure and crystallizes in the Ia3 space group. The lattice parameters (a=10.224(1) Angstrem) have been determined using the powder X-ray diffraction. Spectral-kinetic measurements have allowed to detect two symmetrically independent optical centers of Tm3+ ions in the crystal fiber.