Generation of high-OAM ultraviolet twisted light for RF-photoinjector applications

TL;DR

This paper demonstrates the generation of high-OAM ultraviolet twisted light at 266 nm using integrated diffractive optical elements, enabling controlled vortex electron beams for RF-photoinjector applications.

Contribution

It introduces a novel combination of optical elements to produce high-purity, high-OAM ultraviolet vortex beams suitable for accelerator use.

Findings

High-purity OAM mode with l=64 achieved

Conversion efficiency of 80% for spiral phase plate

Controlled OAM bandwidth and spectral properties demonstrated

Abstract

The generation of relativistic vortex electron beams via photoemission requires ultraviolet laser beams with well-controlled orbital angular momentum (OAM) and compatibility with radio-frequency (RF) photoinjector drive-laser systems. High-OAM vortex beams at a wavelength of 266 nm are generated using three fabricated diffractive optical elements integrated into an operational photoinjector beamline: a reflective fork grating, a high-topological-charge spiral phase plate, and binary axicons. The spiral phase plate produces a high-purity Laguerre-Gaussian mode with an OAM of l = 64 and a conversion efficiency of 80%, whereas binary axicons generate low-divergence quasi-Bessel beams forming a superposition of multiple OAM states with a finite OAM bandwidth imposed by their binary phase structure. Fork gratings provide flexible access to lower OAM values and enable robust modal diagnostics. The generated beams are characterized using cylindrical-lens mode conversion and radial intensity analysis, demonstrating practical control of both the OAM content and spectral bandwidth of ultraviolet structured light for accelerator-based applications.