Generation of optical vortices in a magnetic hologram grating and an astigmatic lens converter

Alexei N. Alexeyev; O. S. Borodavka; Alexander V. Volyar; V. G. Vishnevskiyi; Nikolaj A. Groshenko

doi:10.1117/12.317701

3 August 1998 Generation of optical vortices in a magnetic hologram grating and an astigmatic lens converter

Alexei N. Alexeyev, O. S. Borodavka, Alexander V. Volyar, V. G. Vishnevskiyi, Nikolaj A. Groshenko

Proceedings Volume 3487, International Conference on Singular Optics; (1998) https://doi.org/10.1117/12.317701
Event: International Conference on Singular Optics, 1997, Partenit, Crimea, Ukraine

Abstract

Experimentally the process of magneto-optical diffraction of light on ferrit-garnet magnetic films with a stripe domain structure with occasional defects in magnetic lattice of a 'fork' type was studied. The analyses of the structure of a magnetic lattice and diffraction field of light shows that the domain lattice with a stripe structure by its action on a laser radiation corresponds to a phase computer-synthesized hologram of a single pure screw dislocation of a wavefront. It is demonstrated that in the result of magneto-optical diffraction on a magnetic hologram it is possible to reconstruct optical vortices with helicoidal wavefronts. The action of a mode convertor which realizes energetically effective conversion of a Hermite-Gaussian beam into a Laguerre-Gaussian beam and vice versa. It is experimentally analyzed is demonstrated that unlike the phase converter studied in reference one the proposed device is less sensitive to matching the astigmatic elements. The application of magnetic holograms in generation of optical vortices enables us to create laser beams with governed parameters. For instance by the action of a gradient field it is possible to shift the position of a singularity in the magnetic lattice, change its sign or eliminate the singularity.

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Alexei N. Alexeyev, O. S. Borodavka, Alexander V. Volyar, V. G. Vishnevskiyi, and Nikolaj A. Groshenko "Generation of optical vortices in a magnetic hologram grating and an astigmatic lens converter", Proc. SPIE 3487, International Conference on Singular Optics, (3 August 1998); https://doi.org/10.1117/12.317701

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