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Behaviour of pulsed vortex beam with high topological charge in ionized dielectrics 
Khasanov O.K., Fedotova O.M., Smirnova T.V., Petukh Yu.N., Volyar A.V., Sukhorukov A.P.

It has come to the attention of Editorial Board of Ukr.J.Phys.Opt. that this article should not have been submitted for publication owing to its substantial replication of an earlier paper (R.A. Vlasov, O.K. Khasanov and T.V. Smirnova 2005. Evolution of tubular singular pulsed beams upon ionization. Quantum Electronics 35: 947-952). 

Consequently this paper has been retracted by the Editorial Board of Ukr.J.Phys.Opt. 
 

Dynamics of powerful femtosecond singular-phase pulsed beams in a dielectric medium is analyzed under the ionization conditions. The multiphoton ionization is revealed to contribute to the stable (quasi-soliton) regime of pulse propagation over the distances exceeding several diffraction lengths.

Keywords: femtosecond pulsed beam, singular phase, topological charge, Kerr nonlinearity, multiphoton ionization, free-electron plasma

PACS: 41.85.–p, 42.65.Jx
UDC: 535.31
Ukr. J. Phys. Opt. 9 10-21   doi: 10.3116/16091833/9/1/10/2008
Received: 23.11.2007
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