Bi-color spatial solitons in linearly uncoupled planar waveguides
- Autori: COLACE L; LEO G; AMOROSO A; DI FALCO A; CINO AC; ASSANTO G
- Anno di pubblicazione: 2004
- Tipologia: Articolo in rivista
- OA Link: http://hdl.handle.net/10447/11268
Abstract
We report on the observation of spatial optical simultons in a novel geometry consisting of two partially overlapped, linearly uncoupled planar waveguides in lithium niobate obtained by reverse proton exchange. Two orthogonally polarized modes are coupled through an off-diagonal tensor element of the quadratic nonlinearity, giving rise to second harmonic generation and mutual trapping via cascading. This phenomenon demonstrates a balance between diffraction and self-focusing for two orthogonal modes of different waveguides, and occurs at room temperature in longitudinally uniform waveguides.