title: Measurement of optical two-photon gain in electrically pumped AlGaAs at room temperature.
abstract: We demonstrate experimentally two-photon gain in semiconductor structures, shown previously only in dilute atomic systems. Two-photon gain is directly observed and characterized in electrically pumped room-temperature semiconductor devices, in good agreement with theory. The semiconductor structure was designed to enhance the two-photon interaction and reduce parasitic effects. The nonlinear two-photon amplification is studied directly by examining the current dependence of the optical intensity growth, and indirectly by monitoring the reduction in one-photon emission due to two-photon transitions above transparency.
authors.affiliation: Department of Electrical Engineering, Technion, Haifa 32000, Israel. nevet@tx.technion.ac.il
authors.forename: Amir
authors.initials: A
authors.lastname: Nevet
authors.forename: Alex
authors.initials: A
authors.lastname: Hayat
authors.forename: Meir
authors.initials: M
authors.lastname: Orenstein