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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Observation of chromatic effects near a white-light vortex

Jonathan Leach and Miles Padgett

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Using a spatial light modulator to modify the phase of a light beam we create a spatially coherent, white-light beam containing an optical vortex. All the spectral components are helically phased; hence the beam carries an orbital angular momentum that is an integer multiple of planck per photon. A low-dispersion prism, positioned after the modulator, ensures that the vortices associated with each spectral component are co-axial. In addition, deliberate introduction of slight spectral dispersion means that the vortices associated with each wavelength no longer overlap. Subsequent examination near the beam axis reveals the chromatic effects predicted by Berry (2002 New J. Phys. 4 66; 74).


PACS

42.25.Kb Coherence

42.79.Bh Lenses, prisms and mirrors

Subjects

Optics, quantum optics and lasers

Dates

Issue 1 (November 2003)

Received 17 October 2003

Published 19 November 2003



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