Laser Operation of Tm Near 2-µm in the Disordered Double Tungstate Host NaGd(WO 4 ) 2

Lasing with an output power up to 300 mW is reported for Tm:NaGd(WO4)2, both with Ti-sapphire and diode laser pumping. This disordered crystal grown by the Czochralski method allowed tuning from 1813 to 2025 nm.