2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/91625We present a time-dependent perturbative approach adapted to the treatment of intense pulsed interactions. We show there is a freedom in choosing secular terms and use it to optimize the accuracy of the approximation. We apply this formulation to a unitary superconvergent technique and improve the accuracy by several orders of magnitude with respect to the Magnus expansion.4 pages, 2 figuresQuantum Physicstext