【摘 要】
：
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+ ∶4I11/2 → 4I13/2 mid-infrared transition at the 2.7 μm with 74.1％
【机 构】
：
State Key Laboratory of Crystal Materials,Institute of Novel Semiconductors,Shandong University,Jina
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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+ ∶4I11/2 → 4I13/2 mid-infrared transition at the 2.7 μm with 74.1％ energy transfer efficiency from Er3+ ∶ 4I13/2 to Pr3+ ∶3F4.By using the Judd-Ofelt theory,the stimu-lated 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 knowl-edge.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.
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