Phys. Rev. Lett. 81, 4828–4830 (1998)Rotational Frequency Shift of a Light BeamReceived 28 May 1998; published in the issue dated 30 November 1998 We explain the rotational frequency shift of a light beam in classical terms and measure it using a mm-wave source. The shift is equal to the total angular momentum per photon multiplied by the angular velocity between the source and observer. This is analogous to the translational Doppler shift, which is equal to the momentum per photon multiplied by the translational velocity. We show that the shifts due to the spin and orbital angular momentum components of the light beam act in an additive way. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.4828
DOI:
10.1103/PhysRevLett.81.4828
PACS:
32.70.Jz, 03.65.Bz, 42.25.Ja, 42.79.Nv
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