Quasi-intrinsic angular momentum and the measurement of its spectrum

Roberta Zambrini, S.M. Barnett

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)


We introduce the concept of quasi-intrinsic angular momentum to denote fields for which the mean value of the angular momentum is unaltered by a lateral shift of the rotation axis but the spectrum changes. This property is exemplified by the orbital angular momentum of a beam of light about its propagation direction. We propose an interferometric experiment to measure efficiently the exact angular momentum spectrum and variance for light beams with any arbitrary spatial distribution.
Original languageEnglish
Pages (from-to)113901-1
Number of pages113900
JournalPhysical Review Letters
Issue number11
Publication statusPublished - Mar 2006


  • quasi-intrinsic angular momentum
  • spectrum
  • orbital angular momentum
  • light
  • optics
  • photonics


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