Fig. 1. ETASR gratings with different q values. (a) q = 6; (b) q = 8; (c) q = 10; (d) q = 6.5; (e) q = 8.5; (f) q = 10.5.

Fig. 2. Simulation graphs of carpet beams. First row: the intensity patterns. Second row: the phase patterns. The parameters correspond to Fig. 1.

Fig. 3. Phase anomalies of the carpet beams. The phase profiles along the x axis with (a) q = 8; (b) q = 8.5.

Fig. 4. x–z cross-section through the intensity volume carpet beam propagation. The location is taken from the white line in Fig. 2. (a) q = 8; (b) q = 8.5.

Fig. 5. Experimental system of generating carpet beams.

Fig. 6. (a)–(f) Experimentally recorded graphs of the integer-order and half-integer-order carpet beams with different spokes and the same parameters corresponding to Fig. 2.

Fig. 7. Experimentally recorded graphs of 8-order carpet beams at different propagation distances after axicon. (a) z = 70 cm; (b) z = 80 cm; (c) z = 90 cm.