Negative-frequency dispersive wave generation in quadratic media

Matteo Conforti (1) , Niclas Westerberg (2) , Fabio Baronio (1) , Stefano Trillo (3) , Daniele Faccio (2)

1 Dipartimento di Ingegneria dell'Informazione [Brescia]
2 HWU - Heriot-Watt University [Edinburgh]
3 Engineering Department [Ferrara]

We show that the extremely blueshifted dispersive wave emitted in Kerr media owing to the coupling with the negative-frequency branch [E. Rubino et al., Phys. Rev. Lett. 108, 253901 (2012)] can be observed in quadratic media via second-harmonic generation. Not only is such a phenomenon thus independent of the specific nonlinear mechanism, but it is shown to occur regardless of the fact that the process is pumped by a pulse which exhibits soliton-like features or vice versa undergoes wave breaking. A simple unified formula gives the frequencies of the emitted dispersive waves in both cases.

Domaines: Optique [physics.optics]; Formation de Structures et Solitons [nlin.PS]

Matteo Conforti, Niclas Westerberg, Fabio Baronio, Stefano Trillo, Daniele Faccio. Negative-frequency dispersive wave generation in quadratic media. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2013, 88 (1), ⟨10.1103/PhysRevA.88.013829⟩. ⟨hal-02394219⟩