RESUMO
We report on power scaling and efficient operation of a Ho:Y2O3 ceramic laser at 2.1 µm in-band pumped with an incoherently beam combined high power and narrow-linewidth Tm fiber source at 1931.2â nm. The 0.5 at.% Ho3+ doped Ho:Y2O3 ceramic is fabricated in-house with scattering loss of < 0.25% cm-1. Up to 210.5 W of continuous-wave output power has been generated at 2117â nm for 366 W absorbed pump power shaped with a one-dimensional top-hat profile, corresponding to a slope efficiency of 60.0% with respect to the absorbed pump power. A slope efficiency of 67.5% has been demonstrated with 160 W of output power using a circular beam pump configuration. Results presented in this work verify the superior power scaling capability of a Ho:Y2O3 ceramic laser with high efficiency at â¼2.1 µm.
RESUMO
We report on the high-power operation of an Er:Y2O3 ceramic laser at approximately 1.6â µm using a low-scattering-loss, 0.25â at.â % Er3+-doped ceramic sample fabricated in-house via a co-precipitation process. The laser is in-band pumped by an Er, Yb fiber laser at 1535.6â nm and generates 10.2â W of continuous-wave (CW) output power at 1640.4â nm with a slope efficiency of 25% with respect to the absorbed pump power. To the best of our knowledge, this is the first demonstration of an approximately 1.6â µm Er:Y2O3 laser at room temperature. The prospects for further scaling of the output power and lasing efficiency via low Er3+ doping and reduced energy-transfer upconversion are discussed.