Enhanced ~2.7 µm emission investigation of Er³⁺:⁴I_11/2→⁴I_13/2 transition in Yb,Er,Pr:SrLaGa₃O₇ crystal

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• 作者：Yan Wang^a ; Baotong Zhang^a ; ^b ; Jianfu Li^a ; Zhaojie Zhu^a ; Zhenyu You^a ; Chaoyang Tu^a ; ^{tcy@fjirsm.ac.cn}
• 关键词：Rare earth-doped materials ; Crystal growth ; Erbium lasers ; Mid-infrared spectroscopy ; Energy transfer
• 刊名：Journal of Luminescence
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：183
• 期：Complete
• 页码：201-205
• 全文大小：1275 K
• 卷排序：183

文摘

The bulk crystal of 5at% Yb3+, 20 at% Er3+ and 0.2 at% Pr3+ triply doped SrLaGa3O7 (abbr. as Yb,Er,Pr:SLGO) was grown by the Czochralski method. The effects of co-dopant Yb3+ and Pr3+ on the spectroscopic properties and the mutual energy transfer mechanism were investigated, via the measurements of its absorption, near-infrared and mid-infrared fluorescence spectra, as well as the fluorescence decay curves of Er3+:4I13/2 and 4I11/2 levels at room temperature. As compared with 20at% Er3+ singly doped SrLaGa3O7 crystal, ~2.7 µm emission intensity corresponding to Er3+:4I11/2→4I13/2 transition is enhanced greatly in the Yb,Er,Pr:SLGO crystal. Spectral analyses indicate that the sensitization of Yb3+ to Er3+ improves the ~2.7 µm emission in Yb,Er,Pr:SLGO crystal, meanwhile, the depopulation of Pr3+ from Er3+ decreases the ~1.5 µm emission and inhibits the self-termination effect. The energy transfer efficiencies of Yb3+→Er3+ (ET1), Er3+→Pr3+ (ET2) and Er3+→Pr3+ (ET3) were estimated and discussed. The above results conclude that Yb,Er,Pr:SLGO crystal is a good candidate for LD pumped mid-infrared laser.