Abstract

In this paper, the absorption and fluorescence spectra of Er³⁺, Pr³⁺ co-doped LiYF₄ (Er,Pr:YLF) crystal were measured and analyzed. The Pr³⁺ co-doping was proved to effectively enhance the Er³⁺:I4_11/2→I4_13/2 mid-infrared transition at the 2.7 µm with 74.1% energy transfer efficiency from Er³⁺:I4_13/2 to Pr³⁺:F3₄. By using the Judd–Ofelt theory, the stimulated emission cross section was calculated to be 1.834×10⁻²⁰  cm² at 2685 nm and 1.359×10⁻²⁰  cm² at 2804.6 nm. Moreover, a diode-end-pumped Er,Pr:YLF laser operating at 2659 nm was realized for the first time, to the best of our knowledge. The maximum output power was determined to be 258 mW with a slope efficiency of 7.4%, and the corresponding beam quality factors Mx2=1.29 and My2=1.25. Our results suggest that Er,Pr:YLF should be a promising material for 2.7 µm laser generation.

© 2021 Chinese Laser Press

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