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

We report on the diffraction of non-zero Laguerre Gaussian laser beams by an opaque disk. We observe a tiny circular dark zone at the centre of the usual Arago-Poisson diffraction bright spot. For such non-diffracting dark hollow beams, we have measured diameters as small as 20 μm on distances of th...

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Bibliographic Details
Published in:Europhysics letters 2013-03, Vol.101 (5), p.54005
Main Authors: Emile, O., Voisin, A., Niemiec, R., Viaris de Lesegno, B., Pruvost, L., Ropars, G., Emile, J., Brousseau, C.
Format: Article
Language:English
Subjects:
42.25.Fx
42.50.Tx
42.87.Bg
Instrumentation and Detectors
Optics
Physics
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Summary:We report on the diffraction of non-zero Laguerre Gaussian laser beams by an opaque disk. We observe a tiny circular dark zone at the centre of the usual Arago-Poisson diffraction bright spot. For such non-diffracting dark hollow beams, we 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