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标题：Faraday rotation and photoluminescence in heavily Tb3+-doped GeO2-B2O3-Al2O3-Ga2O3 glasses for fiber-integrated magneto-optics
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作者：Guojun Gao ; Anja Winterstein-Beckmann ; Oleksii Surzhenko 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
期号：1
DOI：10.1038/srep08942
语种：English
出版社：Springer Nature
摘要：We report on the magneto-optical (MO) properties of heavily Tb³⁺-doped GeO₂-B₂O₃-Al₂O₃-Ga₂O₃ glasses towards fiber-integrated paramagnetic MO devices. For a Tb³⁺ ion concentration of up to 9.7 × 10²¹ cm⁻³, the reported glass exhibits an absolute negative Faraday rotation of ~120 rad/T/m at 632.8 nm. The optimum spectral ratio between Verdet constant and light transmittance over the spectral window of 400–1500 nm is found for a Tb³⁺ concentration of ~6.5 × 10²¹ cm⁻³. For this glass, the crystallization stability, expressed as the difference between glass transition temperature and onset temperature of melt crystallization exceeds 100 K, which is a prerequisite for fiber drawing. In addition, a high activation energy of crystallization is achieved at this composition. Optical absorption occurs in the NUV and blue spectral region, accompanied by Tb³⁺ photoluminescence. In the heavily doped materials, a UV/blue-to-green photo-conversion gain of ~43% is achieved. The lifetime of photoluminescence is ~2.2 ms at a stimulated emission cross-section σ _em of ~1.1 × 10⁻²¹ cm² for ~ 5.0 × 10²¹ cm⁻³ Tb³⁺. This results in an optical gain parameter σ _em* τ of ~2.5 × 10⁻²⁴ cm²s, what could be of interest for implementation of a Tb³⁺ fiber laser.