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Proceedings Paper

Optimization of luminescence properties of Ln3+:fluorosilicate glasses to fabricate waveguides for photonics applications
Author(s): C. K. Jayasankar; K. Linganna
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Paper Abstract

Ln2O3-doped fluorosilicate (SNbKZF: SiO2 - Nb2O5 - K2O - ZnF2) glasses were prepared and characterized through various spectroscopic techniques such as optical absorption, excitation and emission spectra at room temperature to derive luminescence properties of Ln3+ ions in these glasses. Judd-Ofelt analysis has been successfully applied to evaluate the Judd-Ofelt intensity parameters Ωλ (λ = 2,4 and 6) and in turn radiative properties such as radiative transition probabilities AR, branching ratios βR, radiative lifetime τR and stimulated emission cross-sections σ( λp) of the fluorescent levels of Ln3+ ions in titled glasses. The predicted values of τR and βR from the fluorescent level to its lower lying levels have been compared with the experimental ones. The fluorescence decay rates have been measured and are found to exhibit single exponential nature at lower concentrations and turn into non-exponential at higher concentrations. The non-exponential decay rates are well-fitted to Inokuti-Hirayama model for S = 6 indicating that the nature of the energy transfer process among the Ln3+ ions is of dipole-dipole type. In the present work all our systematic analysis has been presented with an example of results obtained in Sm3+: SiO2 - Nb2O5 - K2O - ZnF2 glasses. These results are used to access the gain media and in turn useful not only to write waveguides but also to modify the fluorescence properties through femtosecond laser irradiation.

Paper Details

Date Published: 26 July 2011
PDF: 7 pages
Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 80010P (26 July 2011); doi: 10.1117/12.892141
Show Author Affiliations
C. K. Jayasankar, Sri Venkateswara Univ. (India)
K. Linganna, Sri Venkateswara Univ. (India)


Published in SPIE Proceedings Vol. 8001:
International Conference on Applications of Optics and Photonics

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