The phase difference profiles along one direction of Fig. 4. The independently controlled number of segments of the spatial light modulator is 64 × 64 = 4096. For (a) to (l), the number of peaks of each picture is 0 , 1 , 2 , 3 , … , 11 , respectively. The asterisks denote the simulated phase differences, while the blue curves denote the phases of the observed fringe patterns. (m)–(p) The phase difference profiles along the central horizontal direction of Figs. 4(m)–4(p).