Abstract
Multimode strip waveguides are formed in glass plates by field-assisted silver-sodium ion exchange using evaporated silver as ion supplier. Two kinds of anodes are considered, metal layer and sodium nitrate melt. Study of the side broadening (side diffusion) is carried out for both cases. It is shown that a reduction of the side broadening can be achieved using melted sodium nitrate as anode, which makes it possible to control a two-dimensional index profile.
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