Fig. 1. Schematics of (a) the general OAM beam generation method and (b) the novel OAM beam generation system using the beam array CBC technique.

Fig. 2. Schematic of the input array beams.

Fig. 3. Intensity distributions and phase patterns of the optical near-field and far-field with different topological charges from 1 to 4.

Fig. 4. Experimental setup of the high-power vortex beam generation system using the array beams CBC technique. (SL: seed laser; PA: pre-amplifier; FS: fiber splitter; FPM: fiber phase modulator; FA: fiber amplifier; MFA: mode field adaptor; HRM: high-reflectivity mirror; SLM: spatial light modulator; BSP: beam splitter prism; $\unicode[STIX]{x2460}$: high-power beam array with OAM; $\unicode[STIX]{x2461}$: low-power sampling beam array; $\unicode[STIX]{x2462}$: shrinking beam array; $\unicode[STIX]{x2463}$: beam array incident on SLM; $\unicode[STIX]{x2464}$: beam array without SLM phase modulation; $\unicode[STIX]{x2465}$: beam array with SLM phase modulation; FL: focus lens; PD: photon detector; CCD: charge coupled device; FPGA: field programmable gate array.)

Fig. 5. Normalized voltage values detected by the PD and corresponding spectral densities of the phase noise power. (a) Time-dependent normalized voltages. (b) Corresponding spectral densities.

Fig. 6. Long-exposure beam patterns in different situations (see Visualization for dynamic experimental recording).

Fig. 7. (a) Experimental setup and (b)–(g) interference results of the OAM measurement. (b) Intensity and phase distributions of beams $\unicode[STIX]{x2464}$ and $\unicode[STIX]{x2465}$ with the number of the OAM set to $\ell =+1$; (c), (d) corresponding interference patterns of the theoretical and experimental results. (e), (g) Results for the case $\ell =-1$.