Measurement and Shaping of Perfect Optical Vortex via Cross Phase

TL;DR

This paper introduces a novel method for measuring and shaping perfect optical vortices using cross-phase techniques, enabling precise control of vortex properties and potential applications in optical micro-manipulation.

Contribution

It presents the first experimental use of cross-phase for POV measurement and shaping, including a secondary energy control method for flexible shape manipulation.

Findings

Successfully measured topological charges +3 and ±5 of POVs

Achieved shaping of POV intensity distributions with high-order cross-phase

Demonstrated flexible shape control with minimal impact on orbital angular momentum

Abstract

We investigate a method for the measurement and shaping of a perfect optical vortex (POV) by using the cross-phase for the first time. Experimentally, we propose a method to measure the topological charges +3 and +-5 of POVs with the low-order cross-phase (LOCP) at the Fourier plane; we realize shaping intensity distributions of POVs at the Fourier plane with the high-order cross-phase (HOCP) and show the asymmetric modulation ability of the HOCP for an optical field. Furthermore, we discuss the influence of parameters on the optical field in the shaping process. On this basis, we propose a secondary energy control method that combines the characteristics of the POV, which ensures flexible control of the shape while reducing the impact on the orbital angular momentum of the original POV. This work provides an alternative method to measure and shape a POV, which facilitates applications in optical micro-manipulation.