Dark zone in the centre of the Arago-Poisson diffraction spot of a helical laser beam

In this paper, the authors report on the diffraction of non-zero Laguerre Gaussian laser beams by an opaque disk. They observe a tiny circular dark zone at the centre of the usual Arago-Poisson diffraction bright spot. For such non-diffracting dark hollow beams, they have measured diameters as small...

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Bibliographic Details
Published in:Europhysics letters 2013-03, Vol.101 (5), p.P1-P1
Main Authors: Emile, O, Voisin, A, Niemiec, R, de Lesegno, B Viaris, Pruvost, L, Ropars, G, Emile, J, Brousseau, C
Format: Article
Language:English
Subjects:
Beams (radiation)
Charge
Diffraction
Disks
Gaussian
Gaussian beams (optics)
Helical
Laser beams
Physics
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Summary:In this paper, the authors report on the diffraction of non-zero Laguerre Gaussian laser beams by an opaque disk. They observe a tiny circular dark zone at the centre of the usual Arago-Poisson diffraction bright spot. For such non-diffracting dark hollow beams, they have measured diameters as small as 20 μm on distances of the order of ten metres, without focalization. Diameters depend on the diffracting object size and on the topological charge of the input Laguerre Gaussian beam. These results are in good agreement with theoretical considerations. Potential applications are then discussed.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/101/54005