| Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 15, Number 1, 2019
Highlights of EOSAM 2018
|
|
|---|---|---|
| Article Number | 17 | |
| Number of page(s) | 4 | |
| DOI | https://doi.org/10.1186/s41476-019-0113-4 | |
| Published online | 29 July 2019 | |
Research
Diffraction of a Gaussian beam near the beam waist
1
Nonlinear Optics Laboratory, Institute of Electrophysics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia
2
Department of Optoinformation, South Ural State University, Chelyabinsk, Russia
3
Department of Physics, College of science, Al-Mustansiriyah University, Baghdad, Iraq
Received:
4
March
2019
Accepted:
16
July
2019
The behavior of the light field near the beam waist has attracted considerable attention due to the studies of the light spin-orbit interaction: it’s manifestation as well as potential applications. Similarly, the light beam diffraction can reveal new light particularities. We have studied the far-field diffraction of a Gaussian beam by a half-plane edge placed near the beam waist. We have solved numerically the Helmholtz equation using the spectral method. We have found symmetric penetration of the light energy into the shadow region if we placed the half-plane edge exactly in the beam waist region. The symmetry gets broken down as the edge moves along the optical axis toward or away from the lens at a distance more than 0.01% of the focal length. Experimental verification has been obtained using a Gaussian beam focused by a lens of 4 cm focal length.
The results can be used for precise determination of the beam waist position while investigating the effects of the light spin-orbit interaction in focused Gaussian beams.
Key words: Gaussian beam / Beam waist / Focal plane / Diffraction
Evelina A Bibikova, Nazar Al-wassiti and Nataliya D Kundikova contributed equally to this work.
© The Author(s) 2019
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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