Three-Airy autofocusing beams
Zhang Xiao-Hong1, Wang Fei-Li1, Bai Lu-Yang1, Lou Ci-Bo1, †, Liang Yi2, ‡
       

(a) Schematic diagram of experimental setup, with L denoting lens, BS: beam splitter; SLM: spatial light modulator; sideview of 30-mm propagations of three-Airy autofocusing beams with different angles θ between two wings of each superposed 2D Airy beam: (b) 75°, (c) 90°, and (d) 110°. Insets in panels (b)–(d) show phase masks corresponding to θ = 75°, 90°, 110°. The white dashed curves trace out Eq. (2), indicating trajectories of upper main lobes of three Airy autofocusing beams.