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Polarization switching in a mid-infrared Er:YAlO3 laser

Optics Letters
  • Florent Cassouret, Ahmed Nady, Pavel Loiko, Simone Normani, Alain BRAUD, Weidong Chen, Valentin Petrov, Dunlu Sun, Peixiong Zhang, Bruno viana, Ammar Hideur, and Patrice Camy
  • received 03/13/2024; accepted 04/10/2024; posted 04/10/2024; Doc. ID 523010
  • Abstract: We report on a polarization-resolved study of mid-infrared emission properties of Er3+-doped orthorhombic yttrium aluminum perovskite YAlO3 single crystal. For the 4I11/2→4I13/2 Er3+ transition, the stimulated emission cross-section is 0.20×10-20 cm² at 2919 nm for light polarization E ‖ c. Pumped by an Yb-fiber laser at 976 nm, the 10 at.% Er:YAlO3 laser delivered 1.36 W at 2919 nm with a slope efficiency of 31.4%, very close to the Stokes limit, a laser threshold as low as 33 mW and a linear polarization. Pump-induced polarization switching between E || b and E || c eigen states was observed and explained by excited-state absorption from the terminal laser level.