Fig. 1. Experimental device diagram for generating and detecting OAM of vortex beams

Fig. 2. Schematic of generation of interference mode. (a) Spiral phase plate corresponding to LG05 beam; (b) strip diffraction grating; (c) fork grating; (d) interference petal pattern of LG05 beam; (e) circular LG05 beam

Fig. 3. Comparison of experimental and theoretical results of interference figures. (a) Experimental results; (b) theoretical results

Fig. 4. Phase plates to generate Bessel-Gaussian beams with different OAMs and corresponding petal-like interference field distributions. (a) OAM is positive; (b) OAM is negative

Fig. 5. Phase plates corresponding to high-order multi-ring Laguerre-Gaussian beam

Fig. 6. Interference figures of high-order multi-ring Laguerre-Gaussian beams