Spectroscopic properties of Tm3+/Ho3+ co-doped NaLa(WO4)2 single crystal

► Tm3+/Ho3+:NaLa(WO4)2 crystal was grown successfully by the Czochralski method. ► Broad absorption band and relative high absorption cross section around 795 nm are suitable for AlGaAs laser diode pumping. ► Up-conversion fluorescence in the visible region is harm for the 2 μm emission. ► Good spectroscopic results make this crystal is a potentially host for Ho3+ 2 μm infrared laser.