Infrared spectroscopic properties of Tm3+, Ho3+:NaY(WO4)2 single crystals

► The relative high absorption cross section around 796 nm is suitable for laser diode pumping. ► The 3F4  →  3H6 (Tm3+) and 5I7  →  5I8 (Ho3+) IR transitions are broad emission bands at about 2.0 μm. ► We have demonstrated the end-pumping Tm, Ho: NaY(WO4)2 laser at 2.07 μm.