Localized multi-dimensional optical pulses in non-resonant quadratic materials

The propagation of an optical pulse in a non-resonant multi-dimensional qua dratic material is studied. In a number of relevant cases, the evolution of the pulse is governed by equations of non-linear Schrodinger type with cou pling to mean (i.e. low frequency) fields. The presence of this coupling ca n have a dramatic effect on the dynamics of the optical pulse. In particula r, we show that stable localized multi-dimensional pulses can arise through interaction with boundary terms associated to the mean fields. (C) 2001 IM ACS. Published by Elsevier Science B.V. All rights reserved.