title: Linear up-conversion of orbital angular momentum.
abstract: We experimentally demonstrated that infrared light imprinted with orbital angular momentum (OAM) was linearly converted into visible light using four-wave mixing (FWM) via a ladder-type configuration in 85Rb atoms. Simultaneously, we theoretically simulated this linear conversion process, and the theoretical analysis was in reasonable agreement with the experimental results. A large single-photon detuning process was used to reduce the absorption of the atoms to the up-converted light and to avoid pattern formation in the FWM process. The multi-mode image linear conversion process is important for applications including image communications, astrophysics, and quantum information.
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, China.
authors.forename: D-S
authors.initials: DS
authors.lastname: Ding
authors.forename: Z-Y
authors.initials: ZY
authors.lastname: Zhou
authors.forename: B-S
authors.initials: BS
authors.lastname: Shi
authors.forename: X-B
authors.initials: XB
authors.lastname: Zou
authors.forename: G-C
authors.initials: GC
authors.lastname: Guo