30 September 2003 Surface phenomena in ionic inter-diffusion in optical glasses
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We present theoretical results in modeling ionic inter-diffusion in optical glasses. Several interface phenomena are studied and their influence on the shape and the position of the waveguides is explained. The most important process is re-diffusion. We investigate the influence of the maximum surface concentration, of the clustering and of the time constant for reaching interface equilibrium. Their influence is taken into account by introducing supplementary terms in the inter-diffusion equation or by modifying boundary and initial conditions. All the parameters of the final buried guides depend on surface phenomena. The total amount of ions in the guide, the width at half the maximum, the burying depth and the shape of the profiles depend on surface processes. The influence appears for the mono-mode, as well as for multi-mode structures.
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Alexandru I. Lupascu, Alexandru I. Lupascu, Constantin P. Cristescu, Constantin P. Cristescu, } "Surface phenomena in ionic inter-diffusion in optical glasses", Proc. SPIE 5227, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies, (30 September 2003); doi: 10.1117/12.520077; https://doi.org/10.1117/12.520077

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