Fig. 1. Characteristics of semiconductor laser. (a) Luminescent properties along fast and slow axes; (b) propagation characteristics

Fig. 2. Schematic of the structure of beam shaping system and the bottle beam

Fig. 3. Propagation direction change of light after cylindrical lens

Fig. 4. Beam shaping system of semiconductor laser

Fig. 5. Divergence angle θ' and maximum non-diffraction beam distance zmax versus distance m between gradient index lens and plano-convex cylindrical lens

Fig. 6. Influence of divergence angle θ' of beam incident on axial cone on quasi-Bessel beam. (a) θ'=0°; (b) θ'=0.5°; (c) θ'=1°; (d) θ'=1.5°

Fig. 7. Intensity distributions of bottle beams for different divergence angles of laser beam. (a) 0°; (b) 0.5°; (c) 1°; (d) 1.5°

Fig. 8. Bottle beam length and radius versus beam divergence angle