High Purity Orbital Angular Momentum of Light

TL;DR

This paper introduces a new phase-modulation method for generating high-purity orbital angular momentum light beams, improving mode purity and control while reducing complexity and energy loss.

Contribution

A novel phase-modulation technique for generating high-purity OAM beams with enhanced control and reduced experimental complexity.

Findings

Increased mode purity and reduced singularity splitting.

Effective control of beam divergence within short propagation distances.

Tunable parameter balancing beam purity and power.

Abstract

We present a novel technique for generating beams of light carrying orbital angular momentum (OAM) that increases mode purity and decreases singularity splitting by orders of magnitude. This technique also works to control and mitigate beam divergence within propagation distances less than the Rayleigh length. Additionally, we analyze a tunable parameter of this technique that can change the ratio of beam purity to power to fit desired specifications. Beam generation via this technique is achievable using only phase-modulating optical elements, which reduces experimental complexity and beam energy loss.