Linear Up-conversion of Orbital angular momentum

TL;DR

This paper demonstrates a linear method to convert infrared light with orbital angular momentum into visible light using four-wave mixing in rubidium atoms, supported by both experimental results and theoretical simulations.

Contribution

It introduces a novel linear up-conversion technique for OAM-carrying light using FWM in rubidium atoms, with a focus on reducing absorption and pattern formation.

Findings

Successful experimental demonstration of linear OAM up-conversion

Theoretical simulation aligns with experimental results

Potential applications in image communication and quantum information

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.