Measurement of the rotational frequency shift imparted to a rotating light beam possessing orbital angular momentum

J. Courtial, K. Dholakia, D. A. Robertson, L. Allen, M. J. Padgett

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We observe the frequency shift, lΩ, imparted to a mm-wave beam with an orbital angular momentum of lħ per photon, when the beam is rotated at angular frequency Ω. We show that thisshift, and those found in a number of experiments on the rotation of circularly polarized beams, are special cases of the rotational frequency shift recently predicted by Bialynicki-Birula and Bialynicka-Birula. The measurement also explicitly confirms a theoretical prediction by Nienhuis.

Original languageEnglish
Pages (from-to)3217-3219
Number of pages3
JournalPhysical Review Letters
Issue number15
Publication statusPublished - 1998 Jan 1


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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