Mode conversion in quadratic nonlinear crystals.
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 nm Hermite-Gaussian mode from the zeroth order to the first order using two periodically poled 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.
Department of Physical Electronics, Faculty of Engineering, Tel-Aviv University, Tel-Aviv, Israel. ellenbog@post.tau.ac.il
Tal
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Ellenbogen
Ido
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Dolev
Ady
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Arie