Optical vortices with starlight: Implications for ground-based stellar coronagraphy

Using an l = 1 blazed fork-hologram at the focal plane of the Asiago 122 cm telescope, we obtained optical vortices from the stellar system Rasalgethi (alpha Herculis) and from the single star Arcturus (alpha Bootis). We have analyzed the structure of the optical vortices obtained from non-monochromatic starlight under very poor seeing conditions using a fast CCD camera to obtain speckle patterns and carry out the lucky imaging technique, alternative to adaptive optics. With the insertion of a red filter and of a Lyot stop we performed l = 1 optical vortex coronography the double star HD74010. The results are in agreement with theory and numerical simulations. Our results open the way to applications of optical vortices to ground based astronomical observations, in particular for coronagraphy with l > 1 masks. No intrinsic orbital angular momentum was detected in the starlight.Comment: 4 pages, 5 figures. Revised data analysi

UFA AAC Library Sub-committee Meeting Minutes, September 2001

Meeting report from the University Faculty Assembly Academic Affairs Committee\u27s Library Sub-committee meeting at the University of New England

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Meeting report from the University Faculty Assembly Academic Affairs Committee\u27s Library Sub-committee meeting at the University of New England

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Meeting report from the University Faculty Assembly Academic Affairs Committee\u27s Library Sub-committee meeting at the University of New England

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Meeting report from the University Faculty Assembly Academic Affairs Committee\u27s Library Sub-committee meeting at the University of New England

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Meeting report from the University Faculty Assembly Academic Affairs Committee\u27s Library Sub-committee meeting at the University of New England