Efficient generation of new orbital angular momentum beams by backward and forward stimulated Raman scattering

TL;DR

This paper demonstrates a novel theoretical and numerical method to efficiently generate high-intensity orbital angular momentum beams using stimulated Raman scattering, advancing applications in high-energy physics.

Contribution

It introduces a new approach to produce ultra-intense OAM beams via coupling with OAM Langmuir waves in stimulated Raman scattering, enhancing efficiency and compactness.

Findings

First demonstration of OAM beam generation through backward and forward stimulated Raman scattering.

High energy transfer efficiency from pump to seed beams in the nonlinear regime.

Potential for compact high-intensity OAM laser systems for scientific and industrial use.

Abstract

Laser beams carrying orbital angular momentum (OAM) provide an additional degree of freedom and have found wide applications ranging from optical communications and optical manipulation to quantum information. The efficient generation and operation of ultra-intense OAM beams is a big challenge that has to be met, currently setting a limit to the potential applications of ultra-intense OAM beams in high-energy-density physics studies. Here, we theoretically and numerically demonstrate for the first time that a pump beam with a new OAM state is generated by coupling of the seed pulse with OAM Langmuir waves arising from both backward and forward stimulated Raman scattering mechanisms. Advantage is taken of the high energy transfer efficiency from pump to amplified seed beams by operating in the non-linear regime, as this significantly reduces the size of amplification system and promotes access to high-intensity OAM laser beams for scientific and industrial applications.