Abstract
The planar waveguides are formed by He ion implantation on lithium niobate and lithium tantalate crystals. The refractive index profiles in the waveguides are obtained and fitted. The He ion implantation results in the decrease of indices in the barriers both for lithium niobate and lithium tantalate. In the region of guide, the profiles of the extraordinary indices n e in two crystals are significantly different. The probable reasons are discussed by use of 16O(α, α)16O 3.045 MeV resonance reaction.
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