A BaY2F8 crystal doped with thulium ions has been grown and extensively investigated to exploit widely-tunable laser action at 2 μm. The potential wide-tunability of the Tm:BaY2F8 crystal was demonstrated by performing room-temperature laser experiments. A tunability range from 1849 nm to 2059 nm, strongly limited by the finite bandwith of the adopted laser mirrors, has been obtained. A slope efficiency of 32% and a maximum output power of 0.7 W were also demonstated.
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