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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 15 — Jul. 24, 2006
  • pp: 6604–6612

Tuning the orbital angular momentum in optical vortex beams

Christian H. J. Schmitz, Kai Uhrig, Joachim P. Spatz, and Jennifer E. Curtis  »View Author Affiliations


Optics Express, Vol. 14, Issue 15, pp. 6604-6612 (2006)
http://dx.doi.org/10.1364/OE.14.006604


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Abstract

We introduce a method to tune the local orbital angular momentum density in an optical vortex beam without changing its topological charge or geometric intensity distribution. We show that adjusting the relative amplitudes a and b of two interfering collinear vortex beams of equal but opposite helicity provides the smooth variation of the orbital angular momentum density in the resultant vortex beam. Despite the azimuthal intensity modulations that arise from the interference, the local orbital angular momentum remains constant on the vortex annulus and scales with the modulation parameter, c = (a-b)/(a+b).

© 2006 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(090.0090) Holography : Holography
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(140.7010) Lasers and laser optics : Laser trapping
(230.6120) Optical devices : Spatial light modulators

ToC Category:
Diffraction and Gratings

History
Original Manuscript: May 11, 2006
Revised Manuscript: June 30, 2006
Manuscript Accepted: July 3, 2006
Published: July 24, 2006

Virtual Issues
Vol. 1, Iss. 8 Virtual Journal for Biomedical Optics

Citation
Christian H. J. Schmitz, Kai Uhrig, Joachim P. Spatz, and Jennifer E. Curtis, "Tuning the orbital angular momentum in optical vortex beams," Opt. Express 14, 6604-6612 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-15-6604


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