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]

Focusing versus defocusing nonlinearities in self-trapping due to parametric frequency conversion

CONTI, CLAUDIO;
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.
2001
NONLINEAR WAVES; NONLINEAR OPTICS; SOLITONS
01 Pubblicazione su rivista::01a Articolo in rivista
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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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/134674
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