Fig. 1. Schematic of Bessel beam generated bydefor mable mirror

Fig. 2. Influence of round tip error of deformable mirror on spatial spectrum of generated Bessel beams. (a) Conical wavefront generated by deformable mirror; (b) (c) light intensity distributions on spectrum plane of Bessel beams generated by ideal axicon and practical deformable mirror, respectively; (d) designed spatial filter

Fig. 3. Axial light intensity distributions of generated Bessel beams under different filtering conditions, in which b is width of ring slit. (a) Unfiltered; (b) b=100 μm; (c) b=200 μm; (d) b=400 μm

Fig. 4. Comparison of axial intensity distributions of Bessel beams under different filtering conditions

Fig. 5. Combined filter

Fig. 6. Axial light intensity distributions of elliptical Bessel beam. (a)(b) Experimental results of sectorial filter; (c)(d) experimental results of combined filter; (e)(f) ideal axicon simulation results of combined filter

Fig. 7. Cross-sectional light intensity at different propagation distances

Table 1. Main lobe sizes of elliptical Bessel beam under different propagation distances