152937.fig.005a
(a)
152937.fig.005b
(b)
Figure 5: (a) Optical field on plane. This optical field is formed by two optical fields, and the spatial evolution of these two fields generates the bifurcation effects. (b) The generation of bifurcation effects. The distance between the two images along z-coordinate is approximately 1 cm; after this distance, the optical field remains practically unchanged.