J. Eur. Opt. Society-Rapid Publ. 22, 8( 2026) 81
Figure 2.( a1 – a4) The phase maps.( b1 – b4) The intensity distributions on the initial planes.( c1 – c4) The intensity distributions on the focused planes.( d1 – d4) Three-dimensional intensity distributions on the focused planes. Where l = 2, and k = 632.8 nm.( a1 – d1) c = 4,( a2 – d2) c = 5,( a3 – d3) c = 6,( a4 – d4) c = 8.