Spectroscopic properties of Er3+-doped α-Al2O3

We present the results of comprehensive spectroscopic study of the recently successfully synthesized nanopowders and fully densified transparent ceramics of Er3+-doped α-Al2O3 (corundum). Fluorescence and excitation spectra in a range of temperatures of 10–300 K were used to infer the energy level schemes of the ground state and the first three excited Er3+ multiplets (4I15/2, 4I13/2, 4I11/2, and 4I9/2) in this material. Obtained experimental data also allowed us to assess this material as a potential gain medium for high power laser applications in anticipation that it becomes available in the low-loss grain-aligned ceramic or single crystalline form in the near future.

► We have achieved successful incorporation of Er3+ into both highly crystalline α-Al2O3 powders and ceramics.
► The observed Er3+ ion spectra in α-Al2O3 nanopowders and ceramics exhibit sharp, well resolved emission and excitation lines.
► Fluorescence and excitation spectra were used to infer the energy level schemes of the Er3+ multiplets in α-Al2O3.
► Obtained experimental data allow to assess this material as a potential gain medium for high power lasers.