Far-field slit diffraction and express diagnostics of optical vortices

Aleksandr Bekshaev; Aleksandr Akhmerov; Vijay Kumar; R. P. Singh; Satyajeet Patil

doi:10.1117/12.2554919

6 February 2020 Far-field slit diffraction and express diagnostics of optical vortices

Aleksandr Bekshaev, Aleksandr Akhmerov, Vijay Kumar, R. P. Singh, Satyajeet Patil

Proceedings Volume 11369, Fourteenth International Conference on Correlation Optics; 113690P (2020) https://doi.org/10.1117/12.2554919
Event: Fourteenth International Conference on Correlation Optics, 2019, Chernivtsi, Ukraine

Abstract

The slit diffraction of circular OV beams is studied both theoretically and by experiment, with explicit involvement of the incident beam convergence or divergence (finite value of the wavefront curvature radius). Based on the example of Laguerre-Gaussian mode with zero radial index and non-zero azimuthal index m we confirm that the far-field diffraction pattern contains exactly |m| bright lobes elongated orthogonally to the slit (which was reported previously) and show that the far-field profile possesses an asymmetry with respect to the slit axis depending on the wavefront curvature (which is a new result). Being combined, these features enable simple and efficient means for the simultaneous express diagnostics of the magnitude and the sign of the OV topological charge, which can be useful in many OV applications, including the OV-assisted metrology and information processing.

Citation Download Citation

Aleksandr Bekshaev, Aleksandr Akhmerov, Vijay Kumar, R. P. Singh, and Satyajeet Patil "Far-field slit diffraction and express diagnostics of optical vortices", Proc. SPIE 11369, Fourteenth International Conference on Correlation Optics, 113690P (6 February 2020); https://doi.org/10.1117/12.2554919

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