2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/94510It is shown that the McCall-Hahn theory of self-induced transparency in coherent optical pulse propagation can be identified with the complex sine-Gordon theory in the sharp line limit. We reformulate the theory in terms of the deformed gauged Wess-Zumino-Witten sigma model and address various new aspects of self-induced transparency.Exactly Solvable and Integrable Systemstext