(a) Intensity contrast I_max/I₀, (b) focusing length of three-Airy autofocusing beam with different initial wing angles, (c) intensity contrast I_max/I₀, (d) focusing length of three-Airy autofocusing beam with different values of initial c₀, with circles in panels (b)–(d) denoting simulation results and curve being calculated from Eq. (3), (e) rotation angles of three-Airy autofocusing beam carrying vortex as a function of topological charge for initial wing angle θ = 75°, 90°, 110°, respectively.