Efficient Beam Converter for the Generation of Femtosecond Vortices
Vladlen G. Shvedov, Cyril Hnatovsky, Wieslaw Krolikowski, Andrei V., Rode
TL;DR
This paper presents an efficient optical beam converter that transforms Gaussian femtosecond laser beams into vortex beams with high efficiency and minimal dispersion, suitable for high-energy broadband pulses.
Contribution
It introduces a novel beam converter device that achieves high conversion efficiency for femtosecond vortex beams with no spatial or topological charge dispersion.
Findings
Achieves 75% conversion efficiency for single-charge vortex beams.
Achieves 50% conversion efficiency for double-charge vortex beams.
Enables topological charge determination via focal intensity analysis.
Abstract
We describe an optical beam converter for an efficient transformation of Gaussian femtosecond laser beams to single- or double-charge vortex beams showing no spatial or topological charge dispersion. The device achieves a conversion efficiency of 75% for single- and 50% for double-charge vortex beams and can operate with high energy broad bandwidth pulses. We also show that the topological charge of a femtosecond vortex beam can be determined by analyzing its intensity distribution in the focal area of a cylindrical lens.
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