2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/161872Unlike conventional lasers, diffusive random lasers (DRLs) have no resonator to trap light and no high-Q resonances to support lasing. Due to this lack of sharp resonances the DRL has presented a challenge to conventional laser theory. We present a theory able to treat the DRL rigorously, and provide results on the lasing spectra, internal fields and output intensities of DRLs. Typically DRLs are highly multimode lasers, emitting light at a number of wavelengths. We show that the modal interactions through the gain medium in such lasers are extremely strong and lead to a uniformly spaced frequency spectrum, in agreement with recent experimental observations.13 pages, 4 figures. Supplementary information available at arXiv:0805.4497OpticsDisordered Systems and Neural NetworksMesoscale and Nanoscale PhysicsChaotic Dynamicstext