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Optical spectroscopy, 1.5 μ m emission, and upconversion properties of Er 3 + -doped metaphosphate laser glasses

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Abstract

Metaphosphate glasses doped with five concentrations of Er3+ ions have been investigated through absorption and emission spectra, decay curves, and upconversion measurements. Judd–Ofelt parameters have been evaluated from absorption spectrum of the 1.0mol.% Er3+-doped glass, which are in turn used to predict radiative properties of some important luminescence levels of Er3+ ions in these glasses. Gain bandwidths of an optical amplifier have been evaluated and are compared with those of reported Er3+:glass systems. Temperature dependence of the 1.5μm emission has been studied for the 2.0mol.% Er3+-doped glass from 13K to room temperature. Lifetimes of the I1324 level were measured and are found to decrease with concentration of Er3+ ions after 0.1mol.%. Concentration quenching of lifetimes has been analyzed using the theory developed by Auzel et al. [J. Lumin. 94–95, 293 (2001) ; Opt. Mater. 24, 103 (2003) ]. Infrared to visible upconversion was also measured for three concentrations of Er3+-doped metaphosphate glasses with 794nm excitation. A mechanism, involving excited state absorption and energy transfer upconversion, has been proposed to explain the upconversion process.

© 2007 Optical Society of America

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