Multiple focused-waves production by parametric mixing in a layer with hysteretic quadratic nonlinearity.
Nonlinear scattering of a weak probe wave by a strong pump wave in a layer with nonlinearity hysteresis is analysed. It is demonstrated that a spherical probe wave from a point source after nonlinear process of difference frequency excitation is scattered in several foci. Different foci correspond to different frequencies of the transformed wave spectrum. In the case of a plane pump wave and under the condition that nonlinear scattering proceeds without acoustic mode conversion wave front reversal is possible. To achieve wave front reversal in a layer with hysteretic quadratic nonlinearity the pump wave should have a frequency equal to the frequency of the probe wave or to any of its subharmonics.
Gusev
Vitalyi
V
Faculté des Sciences, Laboratoire de Physique de l'Etat Condensé, Université du Maine, UMR-CNRS 6087, Le Mans, France. vitali.goussev@univ-lemans.fr