Competing wave-breaking mechanisms in quadratic media.
We show that second-harmonic generation in the regime of weak dispersion/diffraction can exhibit a coexistence of wave breaking mechanisms, such that a gradient catastrophe yielding a dispersive shock wave competes with modulational instability, leading to the generation of wavetrains with incommensurate frequencies and eventually to the destruction of the shock wave-train.
CNISM, Dipartimento di Ingegneria dell'Informazione, Università di Brescia, Brescia, Italy. matteo.conforti@ing.unibs.it
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