We show what is believed to be the first coherent white-light optical vortices generated from supercontinuum that have the azimuthally varying phase structure consistent with a monochromatic Laguerre-Gaussian beam. Two methods of Laguerre-Gaussian supercontinuum generation are discussed and contrasted. We use a computer-generated hologram to convert a Gaussian white-light supercontinuum source into Laguerre-Gaussian supercontinuum.
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http://dx.doi.org/10.1364/ol.31.002725 | DOI Listing |
Opt Express
July 2008
SUPA, J.F. Allen Research Labs, School of Physics and Astronomy, University of St Andrews, Fife, KY16 9SS, UK.
We characterize a single beam supercontinuum "white light" trap and determine the trap stiffness in the transverse trapping plane. We realize a holographic white light trapping system using a spatial light modulator, and explore the generation of a dual beam trap and characterize its performance. We also demonstrate optical trapping and rotation of particles using a supercontinuum vortex beam.
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September 2006
Institute for Ultrafast Spectroscopy and Lasers, NASA Center for Optical Sensing and Imaging, Department of Physics, The City College and Graduate School of CUNY, New York, NY 10031, USA.
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