Fig. 1. Schematic of (a) transverse-to-longitudinal mapping of Bessel beam and (b) generation of self-similar Bessel-like beam.

Fig. 2. Propagation process of a zeroth-order Bessel-like beam with linearly varying beam width. (a), (b) Side view of the simulated and experimental propagation process; (c) FWHM versus propagation distance; (d)–(f) intensity cross sections at different propagating distances.

Fig. 3. Same as in Fig. 2 but for piecewise beam width.

Fig. 4. Same as in Fig. 3 but for sinusoidal beam width.

Fig. 5. Propagation process of first- to third-order self-similar vortex Bessel-like beams with sinusoidally varied beam width; (a)–(f) side view of the simulated and experimental propagation process; (g)–(i) corresponding beam width versus propagation distance.