About the correction of laser beams with phase front vortex F.A. Starikov, Yu.V. Dolgopolov, A.V. Kopalkin, G.G. Kochemasov, S.M. Kulikov et S.A. SukharevJ. Phys. IV France, 133 (2006) 683-685DOI: https://doi.org/10.1051/jp4:2006133137