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Dr. Bozena Burtan Gwizdała

Institute of Physics, Cracow University of Technology,Poland.

Title: Spectroscopic properties of fluorotellurite glasses modified by Bi2O3 and BaO

Biography

Biography: Dr. Bozena Burtan Gwizdała

Abstract

We have investigated the spectroscopic properties of Er3+-doped fluorotellurite glasses with the basic molar composition 75%TeO2-10%P2O5-10%ZnO-5%PbF2, modified by replacing 5%TeO2 by metal oxides. The thermal stability of fluorotellurite glasses was improved by the incorporation of other components in the glass matrix. Upon 980 nm excitation, intense luminescence emission around 1,5 mm was observed. It appears that the quantum efficiency of the 4I13/2 / 4I15/2 transition is quite high. The absorption and fluorescence spectra have been analyzed in terms of the standard Judd–Ofelt theory along with the photoluminescence decay of the 4I13/2 and 4S3/2 levels of the Er3+ ion. The absorption and emission spectra of the 4I15/2 ↔ 4I13/2 infrared transition have been analyzed within the McCumber theory to yield the peak emission cross-section and figure of merit (FOM) for the amplifier gain. A new simple method to calculate the mean transition energy of the McCumber approach as the arithmetic average of the barycenter wavelengths of absorption and emission spectra was presented.