The experimental generation of Lorentz beam with sine amplitude and vortex phase modulation wavefront

Abstract

The Lorentz beam with sine amplitude and vortex phase modulation wavefront is produced by employing digital hologram technology in this beam generation experiment. The high-efficiency digital holograms and the final high-quality beams generated by the spatial light modulator are obtained. By changing the topological charge number, amplitude parameter or beam order, many novel intensity distribution patterns are obtained in the experiment, such as center-symmetrical profiles, rotation symmetric profiles, a triangle with a fan hole, a square with a cross hole and a disc with round holes and so on. The experiment results show the topological charge number, amplitude parameter and beam order all have a considerable impact on the experimentally generated intensity profile. The topological charge number is equal to the number of the local intensity minimum holes under some condition. To verify the experimental results, a comparison shows that the shapes and evolution principles of the experimental results are in accord with the desired simulation focal intensity distributions. The generated beam with the tunable property benefits the tunable optical trap application, and it is convenient for a further application. The generation and calculation methods of the beam can pave the way for the related domain.