Influence of astigmatic aberration on partially coherent Gaussian-Schell vortex beam focused by lensacon

Abstract We investigated the propagation properties of a partially coherent GaussianSchell model vortex (PCGSMV) beam in an astigmatically aberrated lensacon optical sys-tem. By applying the extended Huygens-Fresnel principle, we developed a cross-spectraldensity expression for PCGSMV beams passing through a lensacon with aberrant astigma-tism. Our numerical results demonstrated that astigmatic aberration significantl yinfluencesthe intensity distribution and depth of focus. Moreover, our study illustrates the impact ofthe spectral degree of coherence, propagation distance, axicon base angle, and astigmaticaberration coefficien to nth evorte xprofil e.O urresul tsreveal edtha t, atf ardistance s,awide-diameter dark spot size with oscillation was generated. These finding sar esignificantfor applications such as sensor technology, optical trapping, and micro-particle manipulation.