2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/125862We investigate theoretically the phenomenon of so-called fast light in an unconventional regime, using pulses sufficiently short that relaxation effects in a gain medium can be ignored completely. We show that previously recognized gain instabilities, including superfluorescence, can be tolerated in achieving a pulse peak advance of one full peak width.7 pages, 8 figures; Replaced with revised version accepted by JOSA BQuantum Physicstext