Tools to evaluate the quality of optical vortex generated by the SLM

Mateusz Szatkowski; Brandon Norton; Jan Masajada; Rosario Porras-Aguilar

doi:10.1117/12.2669589

31 May 2023 Tools to evaluate the quality of optical vortex generated by the SLM

Mateusz Szatkowski, Brandon Norton, Jan Masajada, Rosario Porras-Aguilar

Proceedings Volume 12574, Holography: Advances and Modern Trends VIII; 125740U (2023) https://doi.org/10.1117/12.2669589
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

In this paper, we propose simple but effective tools to quantify the quality of the optical vortex generated by the SLM. This work was motivated to assist non-experienced users with objective criteria that determine if the optical vortex is of good quality. This, indeed, depends on the particular application, however in general, the user is interested in obtaining as symmetric vortex as possible. Therefore we propose 4 independent quantities calculated over a single-shot intensity distribution of an optical vortex. These quantities examine various vortex features such as contrast, eccentricity, dark-hollow to bright-ring ratio, and singular point position, each time returning the value that can compare various vortices generated within the single setup. The performance of these criteria is shown in the real experimental examples, proving that they can be efficiently applied in modern optical laboratories. With this work, we would like to provide a valuable tool, that can be operated by the non-experienced user in order to correct the imperfection of the optical vortex using digital holography or other setup alignment procedures. All of the presented quantities are available as an open-source, ready-to-use, MATLAB algorithm.

Conference Presentation

Citation Download Citation

Mateusz Szatkowski, Brandon Norton, Jan Masajada, and Rosario Porras-Aguilar "Tools to evaluate the quality of optical vortex generated by the SLM", Proc. SPIE 12574, Holography: Advances and Modern Trends VIII, 125740U (31 May 2023); https://doi.org/10.1117/12.2669589

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KEYWORDS

Optical vortices

Spatial light modulators

Alignment procedures

Digital holography

Imperfections

Laboratories

MATLAB

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