Comment to Manipulating the polarization of laser beams by an external   magnetic field, arXiv:physics/0603175v1
  The basic assumption of the authors of manuscript arXiv:physics/0603175v1 (21 Mar 2006) is that a laser wave differs from a plane wave because of photon coherence. This is not true and therefore their conclusion is also wrong. 
R.Battesti, B.Pinto Da Souza, C.Rizzo, C.Robilliard, J.Vigue