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The refractive index profile of na of ion-implanted potassium niobate (KNbO3) planar waveguides is evaluated for waveguides fabricated with ion energies between 2.0 and 3.5 MeV and doses between 7.5×1014 cm−2 and 3.0×1015 cm−2. The measured mode index values are fitted to a quantitative model that correlates the index profile with the irradiation parameters. The reconstructed profile of na is compared to the profiles of nb and nc which have been determined previously.
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Pliška et al. (1997) studied this question.
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