Optical field reconstruction by self-referenced interference and its application in the orbital angular momentum spectrum measurement

Yutong Zhang; Yidong Liu

doi:10.1117/12.2616372

8 July 2022 Optical field reconstruction by self-referenced interference and its application in the orbital angular momentum spectrum measurement

Yutong Zhang, Yidong Liu

Author Affiliations +

Proceedings Volume 12281, 2021 International Conference on Optical Instruments and Technology: Optoelectronic Imaging/Spectroscopy and Signal Processing Technology; 122810C (2022) https://doi.org/10.1117/12.2616372
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only

Abstract

Vortex beam with helical wavefront has great applications, such as optical communication, optical manipulation, quantum information processing, etc. due to its infinite topological charge. Under disturbance or misalignment, the energy on vortex beam will be cast onto neighbored vortex beams and we get the OAM spectrum, which is essential to the applications of vortex beams. To measure the OAM spectrum, the measurement and reconstruction of the optical field is usually of great importance but an additional reference light is not easy to achieve. Therefore, this paper proposes a self-interferometry scheme suitable for unknown light fields. By incorporating a diffuser into a Sagnac-like loop, we realize a selfinterferometer. Then a two dimensional parallel grating is used to project the interfered field into a Sudoku squares. Tuning the polarization of each square by waveplate and polaroid, five interference patterns are obtained. By performing calculations on the five interference patterns, we can reconstruct the complex field of the original light. Then, a canonical routine, e.g. spiral harmonic expansion, is performed to get the OAM spectrum. This work provides a new method for measuring unknown light field and its OAM spectrum without extra reference light and has potential applications in the accurate detection and analysis of emitted signals in free-space optical communications.

Citation Download Citation

Yutong Zhang and Yidong Liu "Optical field reconstruction by self-referenced interference and its application in the orbital angular momentum spectrum measurement", Proc. SPIE 12281, 2021 International Conference on Optical Instruments and Technology: Optoelectronic Imaging/Spectroscopy and Signal Processing Technology, 122810C (8 July 2022); https://doi.org/10.1117/12.2616372

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KEYWORDS

Polarization

Optical testing

Optical simulations

Beam splitters

Free space optics

Interferometry

CCD cameras

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