Radon transform in OAM interference for sub wavelength displacement measurement

Authors

Damien Marius M. Estacio ⋅ PH National Institute of Physics, University of the Philippines Diliman
Niña Zambale Simon ⋅ PH National Institute of Physics, University of the Philippines Diliman
Nathaniel P. Hermosa II ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

An orbital angular momentum (OAM) interferometer makes use of the superposition of two vortex beams with opposite topological charges to generate a petal-beam. When adding a phase difference to one of the component beams, rotation is introduced to the resulting petal-beam pattern. We propose to automate the analysis of this rotation with the use of Radon transform. Here, we generate a 4-, 10-, and 20-petal beam with a spatial light modulator (SLM) and induce a phase change in one of the component beams. We compare the calculated phase of our algorithm to the phase difference we use to generate the rotation, and our results show a good one to one correspondence. Hence, determining the rotation and corresponding phase difference can be automated using Radon transform.

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Issue

2024: Proceedings of the 42nd Samahang Pisika ng Pilipinas Physics Conference

Article ID

SPP-2024-PD-20

Section

Poster Session D (Photonics and Instrumentation Physics)

Published

2024-06-28

How to Cite

[1]

DMM Estacio, NZ Simon, and NP Hermosa, Radon transform in OAM interference for sub wavelength displacement measurement, Proceedings of the Samahang Pisika ng Pilipinas 42, SPP-2024-PD-20 (2024). URL: https://proceedings.spp-online.org/article/view/SPP-2024-PD-20.