Frequency doubling in surface periodically poled lithium niobate waveguides: Competing effects

Salvatore Stivala, Alessia Pasquazi, Alessandro C. Busacca, Lorenzo Colace, Matteo Cherchi, Antonino Parisi, Alfonso C. Cino, Stefano Riva-Sanseverino, Gaetano Assanto

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

4 Citations (Scopus)


We fabricated alpha-phase proton-exchanged (PE) lithium niobate (LN) channel waveguides quasi phase-matched (QPM) via surface periodic poling (SPP) and carried out the first experimental demonstration of second harmonic generation (SHG) in such devices. In order to quantitatively interpret the experimental data, we took into account not only the periodically-poled transverse region providing 1st-order QPM, but also the homogeneously-inverted portion of the waveguides extending below the shallow domains. By a numerical fit of the data we found that, because of the shallow non-inverted domains with depth of the order of 430nm (to be compared with a waveguide depth of 2.6mm), a cascaded process in phase-mismatch gives rise to an effective self-defocusing response which combines with the cubic nonlinearity of the material to provide the measured SHG resonance shift with power.
Original languageEnglish
Title of host publication2007 European Conference on Lasers and Electro-Optics Europe and the International Quantum Electronics Europe
PublisherIEEE Institute of Electrical and Electronic Engineers
ISBN (Electronic)978-1-4244-0931-0
ISBN (Print)978-1-4244-0930-3
Publication statusPublished - 2007
MoE publication typeA4 Article in a conference publication


Dive into the research topics of 'Frequency doubling in surface periodically poled lithium niobate waveguides: Competing effects'. Together they form a unique fingerprint.

Cite this