Prognostic role of persistence of significant functional mitral regurgitation in idiopathic dilated cardiomyopathy

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• 作者：B. Pinamonti ; F. Della Barca ; M. Merlo ; G. Barbati ; S. Pyxaras ; G. Secoli ; A. Di Lenarda ; G. Sinagra
• 关键词：Optical fibers ; Glasses ; Luminescence ; Borosilicates ; Rare-earths in glasses
• 刊名：European Journal of Heart Failure, Supplements
• 出版年：2008
• 出版时间：June 2008
• 年：2008
• 卷：7
• 期：Supplement 1
• 页码：36-37
• 全文大小：67 K

文摘

Spectroscopic properties of Er³⁺-doped Na₂O–Sb₂O₃–B₂O₃–SiO₂ glasses have been investigated for developing 1.5-μm broadband fiber amplifiers. An intense 1.5-μm near infrared emission with a broad full width at half maximum (FWHM) of 88 nm has been obtained for Er³⁺-doped 5Na₂O–20Sb₂O₃–35B₂O₃–40SiO₂ glass upon excitation with a 980 nm laser diode. The obtained emission cross-section of the ⁴I_13/2 → ⁴I_15/2 transition and the lifetime of the ⁴I_13/2 level of Er³⁺ ions are 6.8 × 10⁻²¹ cm² and 0.36 ms, respectively. It is noted that the product of the emission cross-section and the FWHM of the glass, σ_e × FWHM, is as great as 598.4 × 10⁻²¹ cm² nm, which is comparable or higher than that of Er³⁺-doped bismuth-based and tellurite-based glasses. These special optical properties encourage in identifying them as important materials for potential applications in high performance optics and optical communication networks.