Phys. Rev. Lett. 88, 183902 (2002) [4 pages]Spectral Anomalies at Wave-Front DislocationsReceived 11 December 2001; published 22 April 2002 In a recent Letter, Gbur, Visser, and Wolf [Phys. Rev. Lett. 88, 013901 (2002)] predict that remarkable spectral changes can take place in the neighborhood of phase singularities of a diffracted focused wave. We report here the experimental observation of this anomalous spectral behavior and show that this is a general characteristic of optical vortices. Using a high-resolution interferometric technique, we are able to measure directly both the spectral intensity distribution and the spectral phase at the singular points of optical waves. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.183902
DOI:
10.1103/PhysRevLett.88.183902
PACS:
42.25.-p, 42.25.Kb
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