8 January 2008 Energy exchange between orthogonally polarized waves by cascaded quasi-phase-matched processes
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Abstract
By identifying appropriate quasi-phase-matching (QPM) conditions in z-cut congruent lithium niobate, we demonstrate simultaneous QPM of type-I (ooe) and higher order type-0 (eee) second-harmonic-generation, which share a common second harmonic wave. We demonstrate this experimentally at 1064nm, and show that cascading between these processes occurs. The cascading can result in energy exchange between the cross-polarized fundamentals, indicative of an equivalent 3rd order process. The nonlinear phase shifts and transfer functions resulting from this cascading are explored numerically.
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B. F. Johnston, P. Dekker, S. M. Saltiel, M. J. Withford, Y. S. Kivshar, "Energy exchange between orthogonally polarized waves by cascaded quasi-phase-matched processes", Proc. SPIE 6801, Photonics: Design, Technology, and Packaging III, 680116 (8 January 2008); doi: 10.1117/12.759753; https://doi.org/10.1117/12.759753
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