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Competing nonlinearities in quadratic nonlinear waveguide arrays

: Setzpfandt, F.; Neshev, D.; Schiek, R.; Lederer, F.; Tünnermann, A.; Pertsch, T.


Optics Letters 34 (2009), No.22, pp.3589-3591
ISSN: 0146-9592
Journal Article
Fraunhofer IOF ()
2nd-harmonic generation; optical solitons; lithium-niobate; media

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. (C) 2009 Optical Society of America