Abstract
The rotational Doppler shift of a photon with orbital angular momentum is shown to be an even multiple of the angular frequency of the reference frame rotation when the photon is reflected from the phase-conjugating mirror. The one-arm phase-conjugating interferometer is considered. It contains Dove prisms or other angular-momentum-altering elements rotating in opposite directions. When such interferometer is placed in the rotating vehicle, the rotational Doppler shift appears. As a result, the helical interference pattern will rotate with angular frequency . The accumulation of angular Doppler shift via successive passages through the image-inverting prisms is due to the phase conjugation; for a conventional parabolic retroreflector, the accumulation is absent. The features of such a vortex phase-conjugating interferometry at the single-photon level are discussed.
©2012 Optical Society of America
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