Highly efficient tunable multi-wavelength laser properties of Er3+,Yb3+,Pr3+ triple-doped BaLaGa3O7 crystal at ∼2.7 μm

Abstract

To the best of our knowledge, the spectroscopic and highly efficient tunable multi-wavelength laser properties of Er³⁺,Yb³⁺,Pr³⁺ triple-doped BaLaGa₃O₇ crystals are demonstrated for the first time in this study. The maximum output power of 0.81 W at ∼2.7 μm was obtained under the absorbed pump power of 3.53 W with an optical-to-optical conversion efficiency of 22.9%. The slope efficiency is 27.0%. The results demonstrate that the triple-doped crystals with the sensitizer Yb³⁺ and deactivator Pr³⁺ can not only enhance the pump efficiency effectively but also suppress the self-terminating “bottleneck” effect of Er³⁺ so that the laser threshold is reduced and the laser efficiency is improved. The Er³⁺,Yb³⁺,Pr³⁺ triple-doped BaLaGa₃O₇ crystal is a promising candidate for high-efficiency mid-infrared laser devices.