Watt-level europium laser at 703 nm

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