Journal
OPTICS EXPRESS
Volume 14, Issue 25, Pages 11919-11924Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.14.011919
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Funding
- Engineering and Physical Sciences Research Council [GR/S79923/01] Funding Source: researchfish
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We measure the local skew angle of the Poynting vector within a helically-phased, exp(il phi), beam using a Shack Hartmann wavefront sensor. It is the skew angle of the Poynting vector with respect to the beam axis that gives rise to the orbital angular momentum of a light beam. We confirm that this skew angle is l/kr, corresponding to an orbital angular momentum of lh per photon. Measurement of orbital angular momentum in this way is an alternative to interferometric techniques giving a non-ambiguous result to both the magnitude and sign of l from a single measurement, without any restriction on the optical bandwidth. (c) 2006 Optical Society of America
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