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. 2024 Jun 1;49(11):2970-2973.
doi: 10.1364/OL.523010.

Polarization switching in a mid-infrared Er:YAlO3 laser

Florent Cassouret, Ahmed Nady, Pavel Loiko, Simone Normani, Alain Braud, Weidong Chen, Valentin Petrov, Dunlu Sun, Peixiong Zhang, Bruno Viana, Ammar Hideur, Patrice Camy

Polarization switching in a mid-infrared Er:YAlO3 laser

Florent Cassouret et al. Opt Lett. .

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.

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