title: Time-division multiplexing of the orbital angular momentum of light.
abstract: We present an optical setup for generating a sequence of light pulses in which the orbital angular momentum (OAM) degree of freedom is correlated with the temporal one. The setup is based on a single q plate within a ring optical resonator. By this approach, we demonstrate the generation of a train of pulses carrying increasing values of OAM, or, alternatively, of a controlled temporal sequence of pulses having prescribed OAM superposition states. Finally, we exhibit an "OAM-to-time conversion" apparatus that divides different input OAM states into different time bins. The latter application provides a simple approach to digital spiral spectroscopy of pulsed light.
authors.affiliation: Dipartimento di Scienze Fisiche, Universitá di Napoli Federico II, Napoli, Italy.
authors.forename: Ebrahim
authors.initials: E
authors.lastname: Karimi
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Marrucci
authors.forename: Corrado
authors.initials: C
authors.lastname: de Lisio
authors.forename: Enrico
authors.initials: E
authors.lastname: Santamato