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Proceedings Paper

Local electric fields in optical glasses during field-assisted ionic exchanges
Author(s): Alexandru I. Lupascu; Antoine P. Kevorkian; Constantin P. Cristescu; Ion M. Popescu
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Paper Abstract

We study the phenomena connected with high concentration of incoming ions emerging during field-assisted migration in otpical glass. We find that ion dynamics are very different at concentrations higher and lower than a certain parameter called the transition concentration. To explain anomalies at high ionic concentrations, we introduce a supplementary local electric field. This field opposes to the field E0 existing in the glass at all concentrations of incoming ions and is connected with a local space charge. We investigate its dependence on concentration and on E0. These effects are studied using a model with concentration-dependent diffusion coefficients and mobilities. We present a method to obtain the concentration dependence of the relevant quantities. Theoretical curves are compared with experimental results measured in usual silicate glasses, during Ag+-Na+ exchanges.

Paper Details

Date Published: 23 February 2000
PDF: 7 pages
Proc. SPIE 4068, SIOEL '99: Sixth Symposium on Optoelectronics, (23 February 2000); doi: 10.1117/12.378681
Show Author Affiliations
Alexandru I. Lupascu, Univ. Politehnica Bucharest (Romania)
Antoine P. Kevorkian, Teem Photonics (France)
Constantin P. Cristescu, Univ. Politehnica Bucharest (Romania)
Ion M. Popescu, Univ. Politehnica Bucharest (Romania)

Published in SPIE Proceedings Vol. 4068:
SIOEL '99: Sixth Symposium on Optoelectronics
Teodor Necsoiu; Maria Robu; Dan C. Dumitras, Editor(s)

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