title: Transfer of orbital angular momentum in a multimode parametric oscillator.
abstract: We investigate the transfer of orbital angular momentum (OAM) in a type-II optical parametric oscillator (OPO). We produce different kinds of transverse modes on the downconverted beams by pumping the OPO with a first-order Laguerre-Gaussian beam well above threshold. Different operation regimes are attained showing a rich variety of transverse modes bearing OAM.
authors.affiliation: Instituto de Física-Universidade Federal Fluminense, 24210-346 Niterói-RJ, Brazil.
authors.forename: B Coutinho
authors.initials: BC
authors.lastname: Dos Santos
authors.forename: A Z
authors.initials: AZ
authors.lastname: Khoury
authors.forename: J A O
authors.initials: JA
authors.lastname: Huguenin