Measuring the orbital angular momentum of partially coherent optical vortices through singularities in their cross-spectral density functions

Yuanjie Yang, Michael Mazilu, Kishan Dholakia

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

By analysis of the far-field cross-correlation function (CCF) of partially coherent optical beams, we demonstrate an implicit rule that the number of ring dislocations (dark zones) of the far-field CCF is equal to the original topological charge of an optical vortex rendered partially coherent. This novel link between an optical vortex and its correlation singularity may offer an efficient method for measuring the orbital angular momentum of partially coherent optical vortices in fields such as astrophysics and astronomy, as well as atmospheric laser communication.

Original languageEnglish
Pages (from-to)4949-4951
Number of pages3
JournalOptics Letters
Volume37
Issue number23
DOIs
Publication statusPublished - 2012 Dec 1

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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