Second-harmonic generation in surface periodically poled lithium niobate waveguides: on the role of multiphoton absorption
- Autori: Cherchi, M.; Stivala, S.; Pasquazi, A.; Busacca, A.; RIVA SANSEVERINO, S.; Cino, A.; Colace, L.; Assanto, G.
- Anno di pubblicazione: 2008
- Tipologia: Articolo in rivista (Articolo in rivista)
- OA Link: http://hdl.handle.net/10447/20800
Second harmonic generation is investigated in lithium niobate channels realized by proton exchange and quasi-phase-matched by surface periodic-poling. The reduction in conversion efficiency at high powers is interpreted in terms of multi-photon absorption via two-color terms, yielding an estimate of the dominating three-photon process. Comment: 2 pages, 6 figures