Aberrations Corrections For Vortex Beams Based On Spatial Light Modulators

The high-order Bessel Gaussian beam(BGB)and the abruptly auto-focusing vortex beam(AAFVB)have the characteristics of non-diffraction and self-recovery,which are special advantages in the field of microscopic particle manipulation;The orbital angular momentum(OAM)makes them widely used in optical space communication;In addition,the AAFVB has self-accelerating characteristics: it keeps low-intensity propagation along the curve trajectory until the focus.Combined with picosecond laser with high peak power,BGB and AAFVB can be used in laser ablation,biomedical fields,etc.However,the vortex beams are sensitive to aberrations,which makes related applications are restricted.In order to reduce the static aberrations of the spatial structured beams generation system,this paper combines liquid crystal wave front detection technology based on the optimization algorithm with the original structured light generation system to form the static aberrations correction system.The main work includes the following aspects:(1)Based on the spatial light modulator,static aberration correction system is designed.The system is the hardware implementation of the optimization algorithm for searching the extremes.The implementation process depends on the spatial light modulator to achieve the segmentation of the incident pupil.Experimental and simulation results verify the feasibility of the static aberration correction system.(2)Considering the sensitivity of vortex beams to aberrations,two kinds of non diffractive vortex beams with radial symmetry are designed: one is high order Bessel beam,the other is abruptly autofocusing vortex beam which is a superposition of radial symmetric Airy beams and vortices.In this paper,the size of the central main ring and the non diffractive distance of two kinds of designed non diffractive vortex beams are analyzed,and the difference between the two beams before and after aberration correction under each parameter is shown,which directly shows the effect of the static aberration correction system.The research results may serve as a useful tool in laser micro nano machining,optical particle manipulation,optical microscopy and other applications.