Abstract
We report on stable optical waveguides fabricated by soft-proton exchange in periodically-poled congruent lithium tantalate in the α-phase. The channel waveguides are characterized in the telecom wavelength range in terms of both linear properties and frequency doubling. The measurements yield a nonlinear coefficient of about 9.5 pm/V, demonstrating that the nonlinear optical properties of lithium tantalate are left nearly unaltered by the process.
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