Please use this identifier to cite or link to this item: http://cio.repositorioinstitucional.mx/jspui/handle/1002/333
OPTICAL AND SPECTROSCOPIC PROPERTIES OF ER3+, YB3+ DOPED AND CO-DOPED PHOSPHATE AND TELLURITE GLASSES
Haggeo Desirena
ELDER DE LA ROSA
Acceso Abierto
Atribución-NoComercial-SinDerivadas
SPECTROSCOPY, GLASSES
"In this dissertation, the complete procedure for the fabrication of Er3+, Yb3+ and Ce3+ doped and un-doped glasses with optical quality is described. Various properties were investigated in these glasses, such as spectroscopic, optical, physical and thermomechanical. For phosphate glass an improvement in the fluorescence emission was obtained by modifying the glass composition and co-doping with B2O3, Yb3+ and Ce3+ ions. These changes enhance greatly the NIR emission and reduce the up conversion process. Fluorescence decay time as long as 9 ms, large emission cross section (8 x 10-21 cm2) high quantum efficiency (90%) and low up-conversion can be obtained by choosing adequately both, glass composition and Yb3+/Er3+/Ce3+ concentrations. The primary results indicate that this Yb3+/Er3+/Ce3 co-doped material is a very promising candidate for laser and optical amplifiers. On the other hand, a systematic study about the effect of alkalis (Li, Na, K, Rb and Cs) and network intermediates (Pb, Zn, Ba and Mg) on the physical, thermal and optical properties of tellurite glass were investigated. It was found that the Li2O-ZnOTeO2 ternary glass composition presents good chemical durability, high refractive index, high density, low coefficient of thermal expansion and wide transmission region. The obtained glass composition was analyzed as a function of Er3+ and Yb3+ concentrations. Experimental results show that high Yb3+ and low Er3+ concentration enhance the fluorescence characteristics such as florescence lifetime, energy transfer efficiency, emission cross section and quantum efficiency. Such properties are also strongly influenced by introducing network modifiers (Li, Na and K) and the results indicate that K might be the best spectroscopic network modifier. In general, an enhancement of mechanical properties means a deleterious of spectroscopic properties and vice versa, then, the right selection of glass composition depends on the application and there is often a compromise among many factors."
2010-03
Tesis de doctorado
Inglés
León, Guanajuato
Público en general
Desirena Enrriquez, (2010). "Optical and spectroscopic properties of Er3+, Yb3+ doped and co-doped phosphate and tellurite glasses". Tesis de Doctorado en Ciencias (Óptica). Centro de Investigaciones en Óptica, A.C. León, Guanajuato. 106 pp.
ÓPTICA
Appears in Collections:DOCTORADO EN CIENCIAS (ÓPTICA)

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