Edge diffraction of optical-vortex beams formed by means of the fork hologram

Aleksey Chernykh; Aleksandr Bekshaev; Anna Khoroshun; Lidiya Mikhaylovskaya; Aleksandr Akhmerov; Kadhim Ameen Mohammed

doi:10.1117/12.2220398

30 November 2015 Edge diffraction of optical-vortex beams formed by means of the fork hologram

Aleksey Chernykh, Aleksandr Bekshaev, Anna Khoroshun, Lidiya Mikhaylovskaya, Aleksandr Akhmerov, Kadhim Ameen Mohammed

Proceedings Volume 9809, Twelfth International Conference on Correlation Optics; 980902 (2015) https://doi.org/10.1117/12.2220398
Event: 12th International Conference on Correlation Optics, 2015, Chernivsti, Ukraine

Abstract

We present the experimental and numerical study of the transverse profile for a beam obtained by the screen-edge diffraction of optical-vortex (OV) Kummer beams with topological charges 1, 2 and 3, generated with the help of a “fork” hologram. The main results concern the behavior of the secondary OVs formed in the diffracted beam due to splitting of the incident multicharged OV into a set of single-charged ones. When the screen edge moves across the incident beam, OVs in every cross section of the diffracted beam describe complicated spiral-like trajectories, which distinctly manifests the screw-like nature and the energy circulation in the OV beam. At certain conditions, positions of the separate OVs as well as their mutual configuration (singular skeleton of the diffracted beam) shows high sensitivity to the screen edge dislocation with respect to the incident beam axis. This can be used for remote measurements of small displacements and deformations.

Citation Download Citation

Aleksey Chernykh, Aleksandr Bekshaev, Anna Khoroshun, Lidiya Mikhaylovskaya, Aleksandr Akhmerov, and Kadhim Ameen Mohammed "Edge diffraction of optical-vortex beams formed by means of the fork hologram", Proc. SPIE 9809, Twelfth International Conference on Correlation Optics, 980902 (30 November 2015); https://doi.org/10.1117/12.2220398

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