Coherent optical vortex generation with multiple topological charges based on a seeded free electron laser
HIGH POWER LASER SCIENCE AND ENGINEERING(2021)
摘要
To generate optical vortex with multiple topological charges, a simple scheme based on the phase mask shaping technique is proposed and applied in a seeded free electron laser. With a tailored phase mask, an extreme-ultraviolet (EUV) vortex with multiple topological charges can be produced. To prove the feasibility of this method, an eight-step phase mask is designed to shape the seed laser. The simulation results demonstrate that 100-MW, fully coherent EUV vortex pulses with topological charge 2 can be generated based on the proposed technique. We have also demonstrated the possibility of generating higher topological charges by using a phase mask with more steps.
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关键词
free electron laser, high-gain harmonic generation, optical vortex, phase mask
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