Abstract
We report on the spectropic and continuous-wave (CW) laser properties of a novel Er 3+ -doped mixed garnet (Er:LuYSGG) crystal. The maximum phonon energy of Er:LuYSGG was measured to be 720 cm −1 , which is lower than that of Er:YSGG crystal. Fluorescence lifetimes of 4 I 11/2 and 4 I 13/2 levels amounts to 2.1 ms and 3.2 ms, indicating a potential capability for mid-infrared laser emission. For the CW laser operation, a maximum output power of 472 mW was achieved at 2797 nm, with a slope efficiency of as high as 24%. • An Er 3+ -doped (Lu, Y, Sc)-mixed garnet crystal that has a long fluorescence lifetime ( 4 I 11/2 : >2 ms) is proposed. • The phonon energy of Er:LuYSGG crystal is further reduced compared with that of Er:YSGG. • CW laser performance of Er:LuYSGG crystal gives a slope efficiency of 24%, confriming the feasibility of further power improvement.
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