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Proceedings Paper

Evolution of vortex density in a non-diffracting speckle field with its continuous phase removed
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Paper Abstract

We break down the equilibrium state and the diffraction invariant property of a non-diffracting speckle field by removing its continuous part of the phase while leaving all vortices behind. During the propagation of such a phase corrected non-diffracting speckle field, the vortex density drops down to a minimum value and then comes back to an equilibrium value which is even higher than the initial one. Before the phase corrected field returns back to its new equilibrium state, another least-squares phase removal will be applied, at the position where there is a minimum vortex density, to further remove vortices from the speckle field. Such a process of removing least-squares phase and propagating the phase corrected field over a distance can be repeated to eliminate most of optical vortices. Statistical results show that most of optical vortices can be removed from a non-diffracting speckle field. Finally, a semi-plane wave without optical vortices can be obtained from an initial non-diffracting speckle field with multiple steps of least-square phase correction.

Paper Details

Date Published: 16 September 2011
PDF: 7 pages
Proc. SPIE 8171, Physical Optics, 817104 (16 September 2011); doi: 10.1117/12.896820
Show Author Affiliations
Mingzhou Chen, National Univ. of Ireland, Galway (Ireland)
Chris Dainty, National Univ. of Ireland, Galway (Ireland)

Published in SPIE Proceedings Vol. 8171:
Physical Optics
Daniel G. Smith; Frank Wyrowski; Andreas Erdmann, Editor(s)

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