We demonstrate experimentally the existence of competing focusing and defocusing nonlinearities in a double-resonant system with quadratic nonlinear response. We use an array of periodically poled coupled optical waveguides and observe inhibition of the nonlinear beam self-action independent on power. This inhibition is demonstrated in both regimes of normal and anomalous beam diffraction.
© 2009 Optical Society of America
Original Manuscript: August 24, 2009
Manuscript Accepted: September 28, 2009
Published: November 13, 2009
Frank Setzpfandt, Dragomir N. Neshev, Roland Schiek, Falk Lederer, Andreas Tünnermann, and Thomas Pertsch, "Competing nonlinearities in quadratic nonlinear waveguide arrays," Opt. Lett. 34, 3589-3591 (2009)