Continuous-Wave Laser Operation of Tm and Ho Co-Doped NaY(WO 4 ) 2 and NaLu(WO 4 ) 2 Crystals

Spectroscopy and continuous-wave laser operation of Tm,Ho co-doped NaY(WO4)2 and NaLu(WO4)2 crystals are reported. A tunability range of 1830-2080nm is demonstrated with a maximum output power up to 290mW at around 2040nm during room-temperature operation.