Study of rare earth spectroscopy on glass and optical fibers of tellurite-based glass with potential applications in solid state lasers and non-linear devices

• Grant number: 12/50480-6
• Support type: Scholarships in Brazil - Post-Doctorate
• Effective date (Start): February 01, 2013
• Effective date (End): February 28, 2015
• Field of knowledge: Engineering - Materials and Metallurgical Engineering
• Principal Investigator: Lázaro Aurélio Padilha Junior
• Grantee: Seshadri Meruva
• Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

The present research proposal for FAPESP fellowship is on the fabrication and characterization of rare earth doped tellurite glasses and fibers. The host materials for investigating the incorporation of rare earth ions is tellurite glass because it is a better candidate than silica for laser up-conversion and nonlinear applications in optics. Recently, an addition of oxides of heavy metals such as Nb, Pb and W to tellurite glasses is being studied extensively because they exhibit remarkable changes in both physical and optical properties of these glasses. These properties play a vital role in the fabrication of optical fiber lasers and compact active devices. The focus will be on the design of the laser host material in terms of suitable glass composition and rare earth doping concentration, then fiber preform fabrication and fiber drawing will follow with the optimization of glass composition and doping concentration which induces a reduction of laser cavity. Using thermal techniques such as TGA, DTA and DSC the characteristic temperatures Tg, Tc and Tm will be obtained. The XRD, XPS, SEM, AFM, TEM and FTIR, Raman studies will be used to know the size of the particles and molecular bonds present in the glass. Optical characterization techniques like optical absorption, photoluminescence and decay curves will be recorded to know the excited state dynamics in a rare earth doped tellurite glasses and fibers. The physical, structural, absorption analysis through the Judd-Ofelt computations and luminescence properties between the bulk and corresponding fibers will be compared. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SESHADRI, M.; BARBOSA, L. C.; CORDEIRO, C. M. B.; RADHA, M.; SIGOLI, F. A.; RATNAKARAM, Y. C. Study of optical absorption, visible emission and NIR-vis luminescence spectra of Tm3+/Yb3+, Ho3+/Yb3+ and Tm3+/Ho3+/Yb3+ doped tellurite glasses. Journal of Luminescence, v. 166, p. 8-16, OCT 2015. Web of Science Citations: 13.

SESHADRI, M.; BARBOSA, L. C.; RADHA, M. Study on structural, optical and gain properties of 1.2 and 2.0 mu m emission transitions in Ho3+ doped tellurite glasses. Journal of Non-Crystalline Solids, v. 406, p. 62-72, DEC 15 2014. Web of Science Citations: 17.

SESHADRI, M.; CHILLCCE, E. F.; MARCONI, J. D.; SIGOLI, F. A.; RATNAKARAM, Y. C.; BARBOSA, L. C. Optical characterization, infrared emission and visible up-conversion in Er3+ doped tellurite glasses. Journal of Non-Crystalline Solids, v. 402, p. 141-148, OCT 15 2014. Web of Science Citations: 16.