Polarisation distribution for internal conical diffraction and the superposition of zero and first order bessel beams

D. O'Dwyer, C. Phelan, Y. Rakovich, T. Cizmar, K. Dholakia, J. F. Donegan, J. G. Lunney

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Internal conical refraction leads to the formation of zero (J0) and first order (J1) Bessel beams in superposition. The (J 0) beam retains the input circular polarisation and the (J 1) has opposite polarisation but with a single phase change around the beam axis giving it h cross h sign optical angular momentum per photon. This results in the conical beam having 1/2 h cross h sign net optical angular momentum per photon. This provides a simple system in which a beam of 0, 1/2 and h cross sign optical angular momentum can be easily generated and selected with use of only a circular polariser. In the far field the characteristic Bessel beam structures are formed and can be made non-diverging with use of a lens. We report the formation of non-diverging Bessel beam of core diameter (a) of 5.7μm over a maximum non-diverging core length of l(±.05)mm. However due to the fine structure of the conical beam at its beam waist position two cores are produces and are of opposite phase.

Original languageEnglish
Title of host publicationLaser Beam Shaping IX
Publication statusPublished - 2008
EventLaser Beam Shaping IX - San Diego, CA, United States
Duration: 2008 Aug 112008 Aug 12

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceLaser Beam Shaping IX
Country/TerritoryUnited States
CitySan Diego, CA

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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