Observation of the vortex structure of a non-integer vortex beam

Details Observation of the vortex structure of a non-integer vortex beam Observation of the vortex structure of a non-integer vortex beam

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004njph....6...71l&link_type=abstract

New Journal of Physics, Volume 6, Issue 1, pp. 71 (2004).

Physics

48

Scientific paper

An optical beam with an eilphgr phase structure carries an orbital angular momentum of lplanck per photon. For integer l values, the phase fronts of such beams form perfect helices with a single screw-phase dislocation, or vortex, on the beam axis. For non-integer l values, Berry (2004 J. Opt. A: Pure Appl. Opt. 6 259) predicts a complex-phase structure comprising many vortices at differing positions within the beam cross-section. Using a spatial light modulator we produce eilphgr beams with varying l. We examine the phase structure of such beams after propagation through an interference-based phase-measurement technique. As predicted, we observe that for half-integer l values, a line of alternating charge vortices is formed near the radial dislocation.

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