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J. Eur. Opt. Society-Rapid Publ. 22, 8( 2026)
Figure 3.( 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 c = 8 and k = 632.8 nm,( a) l = 1;( b) l = 3;( c) l = 5;( d) l = 7.