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Improving the 1.5 µm photoluminescence emission of Er-doped fluorotellurite thin film glasses

AutorMorea, Roberta ; Fernández, T.T.; Fernández, J.; Balda, R.; Gonzalo, J.
Fecha de publicación19-sep-2016
EditorEuropean Materials Research Society
CitaciónE-MRS Fall Meeting (2016)
ResumenRare earth doped materials play an important role in the development of all-optical networks. In particular, Er-doped waveguide amplifiers (EDWAs) based on the 4I13/2¿4I15/2 emission transition of Er3+ at 1.5 µm can enhance light signals on robust, low-cost, miniature chips. However, the glass hosting Er ions determines their photoluminescence response. In this regard, fluorotellurite glasses present clear advantages over other glasses, such as: a wide transmission region, high refractive index, good glass stability, high corrosion resistance and finally, they show high RE solubility and moderate phonon energy. In this work Er-doped TeO2-ZnO-ZnF2 film glasses are synthesized by Pulsed Laser Deposition, since they are promising to develop broadband EDWAs. Their structure is similar to that of the parent bulk glass and they present a very high transparency in the VIS-NIR wavelength range. However, their emission at 1.5 µm was poor. Thus, as-grown films underwent annealing cycles to improve their NIR emission but, at the same time, avoiding structural and optical modifications. In such a way, the optimal annealing cycle was determined. It led to a 20-fold increase of the emission intensity without affecting the glass film composition and structure. Therefore, the film transparency and refractive index did not vary upon annealing. The annealing significantly decreased the OH- content of the film glasses, which has a strong impact on the improvement of their NIR emission.
DescripciónE-MRS fall Meeting. Pulsed-laser deposition of thin films: 30 years of fundamentals, innovative materials and applications, Warsaw University of Technology, from September 19 to 22, 2016
URIhttp://hdl.handle.net/10261/154611
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