Evolution of phase singularities of Gaussian beams passing through an astigmatic aperture lens

Abstract

The phase singularities of Gaussian beams propagating through an astigmatic aperture lens are studied. Numerical calculation results are given to illustrate how the astigmatism affects the evolution behavior of phase singularities. It is shown that with increasing astigmatic coefficient, the phase singularities shift not only towards the aperture lens, but also towards the z axis. The reorganization process of phase singularities of focused Gaussian beams in the presence of astigmatism with increasing truncation parameter is illustrated by numerical examples.