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 in self-trapping due to parametric frequency conversion / P., DI TRAPANI; A., Bramati; S., Minardi; W., Chinaglia; Conti, Claudio; S., Trillo; J., Kilius; G., Valiulis. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 87:18(2001), p. 183902. [10.1103/PhysRevLett.87.183902]
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Titolo: | Focusing versus defocusing nonlinearities in self-trapping due to parametric frequency conversion | |
Autori: | ||
Data di pubblicazione: | 2001 | |
Rivista: | ||
Citazione: | Focusing versus defocusing nonlinearities in self-trapping due to parametric frequency conversion / P., DI TRAPANI; A., Bramati; S., Minardi; W., Chinaglia; Conti, Claudio; S., Trillo; J., Kilius; G., Valiulis. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 87:18(2001), p. 183902. [10.1103/PhysRevLett.87.183902] | |
Handle: | http://hdl.handle.net/11573/134674 | |
Appartiene alla tipologia: | 01a Articolo in rivista |