We propose a novel all-optical, nonlinear mode-conversion scheme based on cascaded three-wave-mixing phase-matched interactions in quadratic nonlinear crystals. We demonstrate the method experimentally by performing all-optical mode conversion of an input $1636\mathrm{nm}$ Hermite–Gaussian mode from the zeroth order to the first order using two periodically poled ${\mathrm{LiNbO}}_3$ crystals. Nonlinear mode conversion of an input beam into a higher order, orthogonally polarized output beam can be realized using only one quasiperiodic nonlinear structure. Moreover, it can be enhanced for conversion of complex modes, e.g., Laguerre–Gaussian or Bessel modes.

© 2008 Optical Society of America

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