S. G. Dinev, A. A. Dreischuh, A. Naidenov
The variational approach and the potential-curve method are used to study the effect of waveguiding of a probe pulse by an external pulse in a nonlinear medium. The initial delay and the group-velocity mismatch are involved in the analyses without an aberrationless approximation. An analytical expression is obtained for the critical power for induced waveguiding and focusing by an increase in the pump-beam radius with respect to that of the probe beam.