2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/30000Direct experimental evidences for excitonic lasing is obtained in optically pumped V-groove quantum wire structures. We demonstrate that laser emission at a temperature of 10 K arises from a population inversion of localized excitons within the inhomogenously-broadened luminescence line. At the lasing threshold, we estimate a maximum exciton density of about 1.8 105cm-1.11 pages, 4 figures, submitted to Phys. Rev. BMaterials Sciencetext