Local electric fields in optical glasses during field-assisted ionic exchanges

Alexandru I. Lupascu; Antoine P. Kevorkian; Constantin P. Cristescu; Ion M. Popescu

doi:10.1117/12.378681

23 February 2000 Local electric fields in optical glasses during field-assisted ionic exchanges

Alexandru I. Lupascu, Antoine P. Kevorkian, Constantin P. Cristescu, Ion M. Popescu

Proceedings Volume 4068, SIOEL '99: Sixth Symposium on Optoelectronics; (2000) https://doi.org/10.1117/12.378681
Event: SIOEL: Sixth Symposium of Optoelectronics, 1999, Bucharest, Romania

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.

Citation Download Citation

Alexandru I. Lupascu, Antoine P. Kevorkian, Constantin P. Cristescu, and Ion M. Popescu "Local electric fields in optical glasses during field-assisted ionic exchanges", Proc. SPIE 4068, SIOEL '99: Sixth Symposium on Optoelectronics, (23 February 2000); https://doi.org/10.1117/12.378681

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