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Proceedings Paper

Optical vortices in six-wave mixing
Author(s): Matt M. Coles; Mathew D. Williams; David L. Andrews
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Paper Abstract

Optical vortex light engendered with integer units of orbital angular momentum (OAM) may be involved in frequency upconversion. Second harmonic generation is usually forbidden in isotropic media due to parity constraints, but it becomes allowed by six-wave mixing. Here, we present a rigorous quantum analysis for the case of a Laguerre-Gaussian input beam comprising photons endowed with a single unit of OAM. Such a process gives rise to the novel entanglement of orbital momentum in two emergent photons; it transpires that the mechanism delivers a harmonic output whose polarization is essentially parallel to the incident radiation. This investigation ascertains the character of the emission, both under forward propagation and back-reflection geometries, and identifies in detail the form of distribution in the entangled total orbital momentum. A distinctive conical spread, originating from the entangled distribution in the emission pair, affords a potential means to determine the individual angular momenta.

Paper Details

Date Published: 25 February 2014
PDF: 8 pages
Proc. SPIE 8999, Complex Light and Optical Forces VIII, 89990Y (25 February 2014); doi: 10.1117/12.2036767
Show Author Affiliations
Matt M. Coles, Univ. of East Anglia (United Kingdom)
Mathew D. Williams, Univ. of East Anglia (United Kingdom)
David L. Andrews, Univ. of East Anglia (United Kingdom)

Published in SPIE Proceedings Vol. 8999:
Complex Light and Optical Forces VIII
David L. Andrews; Enrique J. Galvez; Jesper Glückstad, Editor(s)

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