Optical loss and Nd3+ non-radiative relaxation by Cu, Fe and several rare earth impurities in phosphate laser glasses

Extinction coefficients (at 1053 nm) and Nd3+ fluorescence quenching rates are reported for Cu, Fe, Dy, Pr, Sm, and Ce at doping concentrations up to 1000 ppmw in two meta-phosphate laser glasses melted under oxidizing conditions (1 atm O2). The extinction coefficient and quenching rate for Cu are 2...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2000-03, Vol.263-264, p.251-262
Main Authors: Ehrmann, P.R, Campbell, J.H, Suratwala, T.I, Hayden, J.S, Krashkevich, D, Takeuchi, K
Format: Article
Language:English
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Summary:Extinction coefficients (at 1053 nm) and Nd3+ fluorescence quenching rates are reported for Cu, Fe, Dy, Pr, Sm, and Ce at doping concentrations up to 1000 ppmw in two meta-phosphate laser glasses melted under oxidizing conditions (1 atm O2). The extinction coefficient and quenching rate for Cu are 2.7(plus/minus 0.1)x10-3 cm-1/ppmw and 10.4plus/minus 0.2 Hz/ppmw, resp. The extinction coefficient and quenching rate for Fe are concentration dependent below 300 ppmw due to an observed change in Fe2+/Fe3+ distribution; an empirically derived expression is used to describe this effect. The extinction coefficient and quenching rates for Dy, Pr, and Sm, are nearly the same: 1.6, 1.2, and 1.3(plus/minus 0.05)x10-5 cm-1/ppmw and 0.89, 0.72, and 0.63plus/minus 0.04 Hz/ppmw, resp., while those for Ce are less: 0.84(plus/minus 0.03)x10-5 cm-1/ppmw and 0.061plus/minus 0.03 Hz/ppmw. The quenching results are explained using the Forster-Dexter theory for dipolar energy transfer. 46 refs.
ISSN:0022-3093
DOI:10.1016/S0022-3093(99)00682-1