文章基本信息

标题：R₂O₃ (R = La, Y) modified erbium activated germanate glasses for mid-infrared 2.7 μm laser materials
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作者：Muzhi Cai ; Beier Zhou ; Fengchao Wang 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep13056
出版社：Springer Nature
摘要：Er³⁺ activated germanate glasses modified by La₂O₃ and Y₂O₃ with good thermal stability were prepared. 2.7 μm fluorescence was observed and corresponding radiative properties were investigated. A detailed discussion of J–O parameters has been carried out based on absorption spectra and Judd–Ofelt theory. The peak emission cross sections of La₂O₃ and Y₂O₃ modified germanate glass are (14.3 ± 0.10) × 10⁻²¹ cm² and (15.4 ± 0.10) × 10⁻²¹ cm², respectively. Non-radiative relaxation rate constants and energy transfer coefficients of ⁴I_11/2 and ⁴I_13/2 levels have been obtained and discussed to understand the 2.7 μm fluorescence behavior. Moreover, the energy transfer processes of ⁴I_11/2 and ⁴I_13/2 level were quantitatively analyzed according to Dexter’s theory and Inokuti–Hirayama model. The theoretical calculations are in good agreement with the observed 2.7 μm fluorescence phenomena. Results demonstrate that the Y₂O₃ modified germanate glass, which possesses more excellent spectroscopic properties than La₂O₃ modified germanate glass, might be an attractive candidate for mid-infrared laser.