Guided-wave frequency doubling in surface periodically poled lithium niobate: competing effects
S. Stivala, A. Pasquazi, L. Colace, G. Assanto, A. C. Busacca, M. Cherchi, S. Riva Sanseverino, A. C. Cino, and A. Parisi
J. Opt. Soc. Am. B 24, 1564-1570 (2007)
Abstract:We carried out second harmonic generation in quasi-phase-matched a-phase Lithium Niobate channel waveguides realized by proton exchange and surface periodic poling. Owing to a limited ferroelectric domain depth, we could observe the interplay between second harmonic generation and self-phase modulation due to cascading and cubic effects, resulting in a nonlinear resonance shift. Data reduction allowed us to evaluate both the quadratic nonlinearity in the near infrared as well as the depth of the un-inverted domains.