2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/6008An effect of stimulated radiation processes on thermal radiation from an accretion disk is considered. The radial density waves triggering flare emission and producing quasi-periodic oscillations in radiation from an accretion disk are discussed. It is argued that the observational data suggest the existence of the weak laser sources in a two-temperature plasma of an accretion disk.1 page, LaTeX 2e, IAU Colloquium 194: Close Binaries in the Galaxy and BeyondAstrophysicstext