Temporal solitons in chi((2)) materials with tilted pulses

We investigate the possibility of obtaining temporal bright solitons in thr ee-wave parametric interaction by using the pulse tilt to modify the effect ive dispersion of the nonlinear crystal. We show that, in the large-beam ap proximation, the temporal evolution of the tilted pulse can be described by (1 + 1)-dimensional equations, which account for the tilt by means of effe ctive group-velocity mismatch and dispersion coefficients. Numerical calcul ations show that the soliton regime is accessible in several experimental c onditions. The limit of the (1 + 1)-dimensional approximation is investigat ed with the aid of a (2 + 1)-dimensional model, (C) 1999 Optical Society of America [S0740-3224(99)00602-5].