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Proceedings Paper

Spatial behavior of a vortex light beam produced by a diffraction grating with embedded phase singularity
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Paper Abstract

A general study of beams produced by a computer-generated hologram representing a diffraction grating with fringe bifurcation is presented. Properties of output beams are considered in connection with violation of ideal geometrical conditions: the input beam shape variations, its shifts and inclinations with respect to the grating. The basic consequences are: (i) presence the "ripple" structure in both amplitude and phase distributions (especially in the nearfield zone) caused by diffraction on the phase singularity (bifurcation point); (ii) in contrast to usual Gaussian beams with exponential amplitude fall-off, diffracted beams demonstrate the power-law decay at the beam periphery; (iii) when the incident beam axis is shifted from the grating center, an output beam with off-axial optical vortex is formed whose spatial evolution tends to the pattern of self-similar rotation. Trajectories of featuring points of the generated optical-vortex beam show regular angular deviation from the nominal positions, which grow with the incident beam shift magnitude and with topological charge of the vortex produced.

Paper Details

Date Published: 22 April 2008
PDF: 12 pages
Proc. SPIE 7008, Eighth International Conference on Correlation Optics, 700806 (22 April 2008); doi: 10.1117/12.796449
Show Author Affiliations
Aleksandr Bekshaev, I.I. Mechnikov National Univ. (Ukraine)
Aleksandr Karamoch, I.I. Mechnikov National Univ. (Ukraine)

Published in SPIE Proceedings Vol. 7008:
Eighth International Conference on Correlation Optics

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