Competing nonlinearities in quadratic nonlinear waveguide arrays.
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.
Setzpfandt
Frank
F
Friedrich-Schiller-University Jena, Max-Wien-Platz 1, 07743 Jena, Germany. f.setzpfandt@uni-jena.de
Neshev
Dragomir N
DN
Schiek
Roland
R
Lederer
Falk
F
Tünnermann
Andreas
A
Pertsch
Thomas
T