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.