Third-harmonic generation via broadband cascading in disordered quadratic nonlinear media
W. Wang, V. Roppo, K. Kalinowski, Y. Kong, D. N. Neshev, C. Cojocaru, J. Trull, R. Vilaseca, K. Staliunas, W. Krolikowski, S. M. Saltiel, and Y. Kivshar,
Opt. Express 17, 20117-20123 (2009).
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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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