25 September 2014 Propagation of optical vortices with fractional topological charge in free space
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The behavior of the optical vortices with fractional topological charges in the far-field is assessed through numerical modeling and confirmed by experimental results. The generation of fractional topological charge variations of the phase within a Gaussian beam was achieved by using a liquid crystal spatial light modulator (LCoS SLM). It is shown that a laser beam carrying an optical vortex with a fractional topological charge evolves into a beam with a topological charge of integer value, specifically an integer value closer to the fractional number in the far field. A potential application of this work is for data transmission within optical telecommunication systems.
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Tamelia Ali, Tamelia Ali, Liubov Kreminska, Liubov Kreminska, Andrii B. Golovin, Andrii B. Golovin, David T. Crouse, David T. Crouse, "Propagation of optical vortices with fractional topological charge in free space", Proc. SPIE 9194, Laser Beam Shaping XV, 91940V (25 September 2014); doi: 10.1117/12.2062048; https://doi.org/10.1117/12.2062048

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