1.Based on the Fresnel diffraction integral, the analytical expression for the field distribution of converging spherical waves passing through an annularaperture is derived and some special cases are discussed.
3.In the paper,the power in the bucket(PIB), β and η parameters are chosen as criteria to characterize the laser beam quality in the far field,then the beam quality of super Gaussian beams passing through a spherically aberrated lens with an annular rectangular aperture is studied.
