Use of skew rays in multimode fibers to generate speckle field with nonzero vorticity

    Authors

    M. A. Bolshtyansky; A. Y. Savchenko;B. Y. Zel'dovich

    Comments

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    Abbreviated Journal Title

    Opt. Lett.

    Keywords

    DISLOCATIONS; Optics

    Abstract

    Beams at the output of an axially symmetric multimode fiber were produced with mostly positive or negative values of angular index m through skew illumination of the input end of the fiber. In this way rays with predominantly positive or negative helicity were excited inside the fiber. The output cw speckle field at the wavelength lambda = 632.8 nm contained large densities N+ and N- of wave-front dislocations, or optical vortices, of both positive and negative sign. Vorticity was defined as V = N+ - N-, was expressed analytically through the Wigner function of the field, and was found experimentally to be in good agreement with theory. (C) 1999 Optical Society of America.

    Journal Title

    Optics Letters

    Volume

    24

    Issue/Number

    7

    Publication Date

    1-1-1999

    Document Type

    Article

    Language

    English

    First Page

    433

    Last Page

    435

    WOS Identifier

    WOS:000079513700003

    ISSN

    0146-9592

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