Abstract: We study parametric frequency conversion in quadratic nonlinear media with disordered ferroelectric domains. We demonstrate that disorder allows realizing broadband third-harmonic generation via cascading of two second-order quasi-phase matched nonlinear processes. We analyze both spatial and polarization properties of the emitted radiation and find the results in agreement with our theoretical predictions.

Keywords: strontium barium niobate; phase-matching gratings; 2nd-harmonic generation; ferroelectric domains; optical superlattice; harmonic-generation; crystals; scattering; light

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