Generation of nonlinear vortex precursors

TL;DR

This paper demonstrates the generation of high-order vortex precursors with orbital angular momentum in dense atomic media, offering potential for advanced optical communication and information processing.

Contribution

It introduces a numerical method to generate and analyze nonlinear vortex precursors carrying high-order OAM in ultrafast pulse propagation.

Findings

Nonlinear precursors are generated due to ultrafast Bloch oscillation.

Vortex precursors are well separated from the main pulse after propagation.

Potential applications in high-capacity, high-speed optical communication.

Abstract

We numerically study the propagation of a few-cycle pulse carrying orbital angular momentum (OAM) through a dense atomic system. Nonlinear precursors consisting of high-order vortex har- monics are generated in the transmitted field due to ultrafast Bloch oscillation. The nonlinear precursors survive to propagation effects and are well separated with the main pulse, which provide a straightforward way of measuring precursors. By the virtue of carrying high-order OAM, the obtained vortex precursors as information carriers have potential applications in optical informa- tion and communication fields where controllable loss, large information-carrying capacity and high speed communication are required.