Fig. 1. The light enters the gradient-index lens

Fig. 2. Index distribution

Fig. 3. Parameters of gradient-index lens

Fig. 4. Angle selectivity of the VBG

Fig. 5. Beam generation scheme and experimental measurement for linear structure light

Fig. 6. Beam shaping by cylindrical lens

Fig. 7. Image of laser diode beam emitted from GRIN lens

Fig. 8. Measurement of beam width by second intensity moments method (precision of unit is 0.1 mm)

Fig. 9. Beam width of the system at different positions