A. Fregosi, F. Brandi, L. Labate, F. Baffigi, G. Cellamare, M. Ezzat, D. Palla, G. Toci, A. Whitehead, L.A. Gizzi
High Power Laser Science and Engineering , Accepted manuscript , 1 - 9, 2025
Abstract
We report the characterization of the pump absorption and emission dynamic properties of a Tm: Lu2O3 ceramic lasing medium using a three mirrors folded laser cavity. We measured a slope efficiency of 73%, which allowed us to retrieve the cross-relaxation coefficient. Th e be havior of ou r sy stem wa s mo deled vi aa se t of ma croscopic ra te eq uations in both the quasi continuous wave and the pulsed pumping regime. Numerical solutions were obtained, showing a good agreement with the experimental findings. The numerical solution also yielded a cross-relaxation coefficient in very good agreement with the measured one, showing that the cross-relaxation phenomenon approaches the maximum theoretical efficiency.
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