We show experimentally and theoretically that cascading due to two-wave parametric frequency conversion in quadratic materials acts as an effective focusing or defocusing nonlinearity, depending not only on mismatch, but also on the selected wave, and the dominant type of process (second-harmonic generation or down-conversion). A dramatic asymmetry of beam spreading and threshold lowering for soliton formation against mismatch is the clear experimental signature of this behavior.
Focusing versus defocusing nonlinearities due to parametric wave mixing
TRILLO, Stefano;
2001
Abstract
We show experimentally and theoretically that cascading due to two-wave parametric frequency conversion in quadratic materials acts as an effective focusing or defocusing nonlinearity, depending not only on mismatch, but also on the selected wave, and the dominant type of process (second-harmonic generation or down-conversion). A dramatic asymmetry of beam spreading and threshold lowering for soliton formation against mismatch is the clear experimental signature of this behavior.File in questo prodotto:
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