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APS » Journals » Phys. Rev. Lett. » Volume 90 » Issue 20
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Phys. Rev. Lett. 90, 203901 (2003) [4 pages]

Geometric Phase Associated with Mode Transformations of Optical Beams Bearing Orbital Angular Momentum

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E. J. Galvez, P. R. Crawford, H. I. Sztul, M. J. Pysher, P. J. Haglin, and R. E. Williams
Department of Physics and Astronomy, Colgate University, Hamilton, New York 13346, USA

Received 24 October 2002; revised 21 January 2003; published 20 May 2003

We present direct measurements of a new geometric phase acquired by optical beams carrying orbital angular momentum. This phase arises when the transverse mode of a beam is transformed following a closed path in the space of modes. The measurements were done via the interference of two copropagating optical beams that pass through the same interferometer parts but acquire different geometric phases. The method is insensitive to dynamical phases. The magnitude and sign of the measured phases are in excellent agreement with theoretical predictions.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.203901
DOI:
10.1103/PhysRevLett.90.203901
PACS:
42.25.Hz, 03.65.Vf
 
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