Аннотация:Flux grown YAl3(BO3)4 (YAB) crystals doped Tm3+ have been characterised by optical spectroscopy
techniques. The absorption and emission spectra in the UV-VIS-NIR region have been measured at 10
and 298 K. The visible emission decay profiles have been measured at room temperature. The low temperature spectra have been used to obtain the energy level scheme of the optically active ion in YAB. The Judd-Ofelt parametrization scheme has been applied to the analysis of the room temperature absorption spectra in order to evaluate the intensity parameters, the branching ratios and the radiative lifetimes of the emitting states. These have been compared with the experimental values.