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Measuring the topological charge of ultrabroadband, optical-vortex beams with a triangular aperture

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OPTICAL SOC AMER
DOI: 10.1364/JOSAB.29.001968

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  1. Fundacao de Amparo a Pesquisa do Estado de Sao Paulo
  2. San Diego Foundation Blasker Grant

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A simple technique for determining the topological charge of supercontinuum optical vortices is presented. The spatial dispersion inherent to generating broadband vortices with a single forked grating is compensated with a double-pass arrangement from a single spatial light modulator. The vortex charge is determined by inspecting the diffraction pattern through a triangular aperture. It is shown that the topological charge is constant, and can be consistently measured, across a wide range of colors. (C) 2012 Optical Society of America

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