2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/17715The non-sinusoidal character oscillations appear in the transmitted, reflected and absorbed light fluxes when light pulses irradiate a semiconductor quantum well (QW), containing a large number of the equidistant energy levels of electronic excitations. A damping echo of the exciting pulse appears through the time intervals $2π\hbar/ΔE$ in the case of the very short light pulses $γ_l^{-1}\ll\hbar/ΔE$.3 pages, 2 figures with captionsMesoscale and Nanoscale Physicstext