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Transition-Metal Ions in Nd-Doped Glasses: Spectra and Effects on Nd Fluorescence

Published online by Cambridge University Press:  25 February 2011

S. E. Stokowski  and
D. Krashkevich
S. E. Stokowski
Affiliation:
Lawrence Livermore National Laboratory, University of California, P.O. Box 5508, L-490, Livermore, CA 94550
D. Krashkevich
Affiliation:
Schott Glass Technologies, Inc., 400 York Avenue, Puryea, PA 18642
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Abstract

We have measured transition-metal ion (Ti, V, Cr, Mn, Fe, Co, Ni, Cu) spectra and their effects on Nd fluorescence quenching in Nd-doped phosphate and silicate glasses. Our purpose was to determine the maximum allowable impurity content given particular limits on the absorption loss at 1053 nm and the Nd fluorescence quenching rate. To keep the absorption loss <0.1 m−1 the transition-metal impurity content should be kept below 0.5 ppmw. To keep the increase in the Nd fluorescence decay rate below 1%, the impurity content should be <3 ppmw. We have also found that the Nd quenching rates do not scale as predicted by the Forster- Dexter dipole-dipole energy transfer theory if we assume that the dominant variation with transition metal is the overlap integral of the Nd fluorescence spectrum and the transition-metal absorption. We suggest that phonon-assisted energy transfer to transition metals is effective in quenching Nd. We find that quenching rates increase 1.5 to 4 times as the Nd concentration increases from 0.5 to 10 × 1020 cm−2.

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Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 61: Symposium P – Defects in Glasses , 1985 , 273
Copyright
Copyright © Materials Research Society 1986

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