title: Two-photon cavity solitons in active optical media.
abstract: We show that broad-area cascade lasers with no absorbing intracavity elements support the spontaneous formation of two-dimensional bright localized structures in a dark background. These cavity solitons consist of islands of two-photon emission embedded in a background of single-photon emission. We discuss the mechanisms through which these structures are formed and interact, along with their properties and stability.
authors.affiliation: Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Colom 11, E-08222 Terrassa, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Vilaseca
authors.forename: M C
authors.initials: MC
authors.lastname: Torrent
authors.forename: J
authors.initials: J
authors.lastname: García-Ojalvo
authors.forename: M
authors.initials: M
authors.lastname: Brambilla
authors.forename: M
authors.initials: M
authors.lastname: San Miguel