Spectroscopy of the yttrium scandate doped by thulium ions

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 $Ia\bar3$ space group. The lattice parameters ($a$ = 10.224(1) $\mathring{\mathrm{A}}$) have been determined using the powder X-ray diffraction. Spectral-kinetic measurements have allowed to detect two symmetrically independent optical centers of Tm$^{3+}$ ions in the crystal fiber.