Fig. 1. Microsectioning axicon and transmission trajectory of spiral Bessel beam. (a) Microsectioning axicon; (b) zero-order spiral Bessel beam; (c) high-order spiral Bessel beam

Fig. 2. Holographic phase diagrams. (a) Γ=6,Δ=10 μm; (b) Γ=-6,Δ=10 μm; (c) Γ=3,Δ=10 μm

Fig. 3. Schematic of experimental setup

Fig. 4. Propagation properties of partially coherent spiral Bessel beams under different distances. (a) z=30 mm; (b) z=60 mm; (c) z=90 mm; (d) z=120 mm; (e) z=150 mm; (f) z=30 mm; (g) z=60 mm; (h) z=90 mm; (i) z=120 mm; (j) z=150 mm; (k) z=30 mm; (l) z=60 mm; (m) z=90 mm; (n) z=120 mm; (o) z=150 mm

Fig. 5. Influence of coherent length on optical field distribution (z=60 mm). (a) l=0; (b) l=1; (c)l=2

Fig. 6. Change curves of light field contrast. (a) Light field contrast versus transmission distance (σ0=0.6 mm); (b) light field contrast versus coherent length (z=60 mm)

Fig. 7. Relationship between maximum helix radius and transmission distance with the parameters of λ=632.8 nm,n=1.5,γ=1°,Γ=6