Watt-level europium laser at 703 nm

We report on a watt-level highly efficient europium laser operating at the 5 D 0 → 7 F 4 transition. It is based on the stoichiometric K E u ( W O 4 ) 2 crystal. Under pumping by a green laser at 532.1 nm, the K E u ( W O 4 ) 2 laser generated a maximum peak output power of 1.11 W at ∼ 703 n m with a slope efficiency of 43.2% and a linear polarization ( E ‖ N m ). A laser threshold as low as 64 mW was achieved. True continuous-wave operation was demonstrated. The polarized emission properties of monoclinic K E u ( W O 4 ) 2 were determined.