Intensity distortion due to the refraction. (a) The dependence of the azimuthally polarized output beam intensity distribution along the azimuthal direction θ with respect to different incidence angle θ_i. (b) The dependence of the radially polarized output beam intensity distribution along the azimuthal direction θ with respect to different incidence angle θ_i. (c) Intensity variations of output beams at incident angles of 5° (the upper panel) extracted from the (a) and (b) along the left dashed lines and the intensity variations of output beams at incident angles of 57°, which is a little below the critical angle (the lower panel) extracted along the right dashed lines in (a) and (b).