Abstract
The light field structure on diffraction of a circular segment-shaped laser beam was studied. At distances of 6–20 cm from a segment-shaped aperture obstructing a circular laser beam, the formation of the beam structure propagating in a slow-expansion mode was detected. The diffracted beam structure has been fully formed in the shadow region at a distance of 20 cm from the obstacle. In the boundary region of the aperture straight edge, the helical beams of the opposite topological charges were reconstructed by the theoretical 3-D propagation of the laser beam.
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