title: Strong interactions in multimode random lasers.
abstract: Unlike conventional lasers, diffusive random lasers (DRLs) have no resonator to trap light and no high-Q resonances to support lasing. Because of 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.
authors.affiliation: Institute of Quantum Electronics, Eidgenössische Technische Hochschule (ETH) Zurich, 8093 Zurich, Switzerland. tureci@phys.ethz.ch
authors.forename: Hakan E
authors.initials: HE
authors.lastname: Türeci
authors.forename: Li
authors.initials: L
authors.lastname: Ge
authors.forename: Stefan
authors.initials: S
authors.lastname: Rotter
authors.forename: A Douglas
authors.initials: AD
authors.lastname: Stone