An experimental study of two-step Ag+/Na+ ion exchange in BK-7 glass substrates in molten solutions consisting of AgNO3/NaNO3 mixtures is presented. This paper describes a method for evaluating the measured mode index spectra and the index profile of double-diffused semiburied waveguides. They are first diffused at 320 degrees C in 2% melt and are then converted to semiburied waveguides by a second diffusion step consisting of a short-time reimmersion in a 0.25% melt. [References: 20]
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