Room-temperature 3.4- mum Dy:BaYb(2)F(8) laser.

We have demonstrated a room-temperature laser on the H613/2–H615/2 transition of Dy3+ in Dy:BaYb2 F8 at 3.40  µm. A pulsed 1.3-µm Nd:YAG laser was used as the pump. Our measured spontaneous-emission spectrum for the H613/2–H615/2 band indicates that this laser should be continuously tunable between 3.0 and 3.4  µm.