Vector singularities of superposition of mutually incoherent orthogonally polarized beams |
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Authors: | A A Chernyshov K V Fel’de G V Bogatyreva P V Polyanskii and M S Soskin |
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Institution: | 1.Fed’kovich National University,Chernovtsy,Ukraine;2.Kiev Polytechnic Institute,Ukraine National Technical University,Kiev,Ukraine;3.Institute of Physics,Ukraine National Academy of Sciences,Kiev,Ukraine |
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Abstract: | It is shown that, at an incoherent superposition of orthogonally polarized laser beams, a special type of singularities are
formed in the cross section of a combined beam in place of the well-known singularities, such as optical vortices (for scalar
fields); C points, at which the polarization is circular; and L lines, along which the polarization is linear (for coherent vector fields). These new singularities are U lines, along which the degree of polarization is zero and the state of polarization is undetermined, and P points, at which the degree of polarization is equal to unity and the state of polarization is determined by the nonzero
component of the combined beam. Conditions of topological stability of U and P singularities are discussed, as well as peculiarities of the spatial distribution of the degree of polarization of the field
in the vicinity of such singularities. First experimental results on the reconstruction of a vector skeleton formed by U and P singularities in combined speckle fields are presented. |
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