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Opt Lett. 2010 May 1;35(9):1317-9. doi: 10.1364/OL.35.001317.

Cerenkov-type second-harmonic generation with fundamental beams of different polarizations.

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  • 1Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.

Abstract

We analyze the conical second-harmonic generation via Cerenkov-type phase matching in two-dimensional decagonal nonlinear photonic quasi-crystals for linear, circular, and elliptical polarized fundamental beams. Depending on the polarization state, we observe either centrosymmetric or noncentrosymmetric intensity modulation of the second-harmonic rings. We explain this effect by employing the concept of effective quadratic nonlinearity combined with the hexagonal symmetry of the individual ferroelectric domains.

PMID:
20436554
[PubMed]
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