2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/95447The excitation of wakefields by a triangular temporal profile laser pulse with an abrupt fall in a step density profile plasma channel is investigated analytically and an exact solution is obtained. The excitation is more efficient for t~tp, where t is the rise time of the pulse and tp is the plasma period, though it is still significant for t~20 tp. The wake potential in the former case is 1.7 times the ponderomotive potential, whereas it falls to 1.4 times the ponderomotive potential for the latter.6 pages. See also physics/0510014Plasma PhysicsAccelerator Physicstext