Watt-Level Europium Laser At 703 Nm

We report on a watt-level highly efficient europium laser operating at the D-5(0) -> F-7(4) transition. It is based on the stoichiometric KEu(WO4)(2) crystal. Under pumping by a green laser at 532.1 nm, the KEu(WO4)(2) laser generated a maximum peak output power of 1.11 W at similar to 703 nm with a slope efficiency of 43.2% and a linear polarization (E parallel to N-m). A laser threshold as low as 64 mW was achieved. True continuous-wave operation was demonstrated. The polarized emission properties of monoclinic KEu(WO4)(2) were determined. (C) 2021 Optical Society of America