Spectroscopy and diode pumped laser emission in (Lux Gd(1-x))3 Ga5O12:Tm3+ single crystal

We report on the first laser emission of (Lux Gd(1-x))3 Ga5O12 doped with Tm³⁺ ions obtaining a slope efficiency of 20% and a maximum output power of 170 mW centered at 2013 nm. Evidences of a multiline emission are shown. Moreover a spectroscopic investigation on six samples of (Lux Gd(1-x))3 Ga5O12:Tm³⁺ having different Lu concentrations is presented. In particular the stark sublevels energy of ³H6 and ³F4 manifolds have been determined. Spectroscopic data have been utilized to calculate absorption and emission cross sections and gain curves.