Parametric downconversion and the orbital angular momentum of light

J. Arlt, K. Dholakia, L. Allen, M. J. Padgett

Research output: Contribution to conferencePaper

Abstract

The orbital angular momentum of light is distinct from the intrinsic angular momentum associated with the polarization state of the light. Thus, linearly polarized laser modes can carry angular momentum. Such orbital angular momentum is associated with light beams with helical wave fronts, one class of which are the Laguerre-Gaussian laser modes. The azimuthal phase factor exp(ilφ) in their field distribution gives rise to an orbital angular momentum equivalent to lh per photon. Degenerate parametric downconversion can be considered as the inverse process to second-harmonic generation. An incoming pump wave generates two fields, signal and idler, with half the pump frequency. Accordingly, a Laguerre-Gaussian pump beam produces signal and idler beams.

Original languageEnglish
Number of pages1
Publication statusPublished - 1998 Jan 1
EventProceedings of the 1998 International Quantum Electronics Conference - San Francisco, CA, USA
Duration: 1998 May 31998 May 8

Conference

ConferenceProceedings of the 1998 International Quantum Electronics Conference
CitySan Francisco, CA, USA
Period98/5/398/5/8

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Arlt, J., Dholakia, K., Allen, L., & Padgett, M. J. (1998). Parametric downconversion and the orbital angular momentum of light. Paper presented at Proceedings of the 1998 International Quantum Electronics Conference, San Francisco, CA, USA, .