Soft proton exchanged channel waveguides in congruent lithium tantalate for frequency doubling

A. C. Busacca, S. Stivala, L. Curcio, P. Minzioni, G. Nava, I. Cristiani, and G. Assanto

Opt. Express 25, 25967-72 (2010)


We report on stable optical waveguides fabricated by soft-proton exchange in periodically-poled congruent lithium tantalate in the a-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 9.5pm/V, demonstrating that the nonlinear optical properties of lithium tantalate are left nearly unaltered by the process.