Spatial vortex four-wave mixing in a five-level atomic system

We propose a scheme for modulating the spatial vortex four-wave mixing (FWM) in a five-level atomic system. During nonlinear FWM process, we find the FWM field can be easily manipulated by adjusting the corresponding parameters. Practically, the vortex phase can be spatially modulated. Thus, our results may be helpful to study nonlinear quantum phenomena based on orbital angular momentum light. (paper)