Analysis of refractive index profile in Tl~+-Na~+ ion-exchanged glass Waveguides by X-ray energy dispersive spectra

摘要

With the thermal diffusion method, the Tl~+ -ion diffusion process in Tl~+-Na~+ ion-exchanged glass is in details described by the electroneutrality field and the stress, which are generated by the huge dimension difference for Tl~+ and Na~+ ions and the large difference in diffusion coefficients between Tl~+ and Na~+ ions. The results of the theoretical analysis and the experiment data by X-ray energy dispersive spectra indicate that the Tl~+ diffusion process is found to be a new diffusion law.