2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93844We present quantum Maxwell-Bloch equations (QMBE) for spatially inhomogeneous optical semiconductor devices taking into account the quantum noise effects which cause spontaneous emission and amplified spontaneous emission. Analytical expressions derived from the QMBE are presented for the spontaneous emission factor beta and the far field pattern of amplified spontaneous emission in broad area quantum well lasers.6 pages Latex and 4 figures, contribution to the proceedings of the ISQM98 conference held August 24th to 27th in TokyoQuantum PhysicsCondensed MatterOpticstext