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Schematics of the pinhole gears. Binary pinhole masks for OAM modes with (a) l = ±2, (e) l = ±3, and (i) l = ±4; (b), (f), and (j) the corresponding simulated absolute values of complex spatial coherence function; (c), (g), and (k) the corresponding simulated phase values of complex spatial coherence function; (d), (h), and (l) the corresponding TC mode power spectrum.
