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Laser beams carrying orbital angular momentum (OAM) provide an additionaldegree of freedom and have found wide applications ranging from opticalcommunications and optical manipulation to quantum information. The efficientgeneration and operation of ultra-intense OAM beams is a big challenge that hasto be met, currently setting a limit to the potential applications ofultra-intense OAM beams in high-energy-density physics studies. Here, wetheoretically and numerically demonstrate for the first time that a pump beamwith a new OAM state is generated by coupling of the seed pulse with OAMLangmuir waves arising from both backward and forward stimulated Ramanscattering mechanisms. Advantage is taken of the high energy transferefficiency from pump to amplified seed beams by operating in the non-linearregime, as this significantly reduces the size of amplification system andpromotes access to high-intensity OAM laser beams for scientific and industrialapplications.

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