journal article·2025-01Open access

Generating High‐Fidelity Structured Light Fields Through an Ultrathin Multimode Fiber Using Phase Retrieval

Ralf Mouthaan, Peter J. Christopher, Kishan Dholakia, George S. D. Gordon, Timothy Wilkinson, Tijmen G. Euser

Advanced Optical Materials· Volume 13· Issue 3

Abstract

Abstract Light transmission through a multimode fiber (MMF) has gained major importance for imaging and manipulation. The majority of phase retrieval algorithms used for a MMF implicitly assume light propagation to be described by a unitary operation, yet the transmission matrix of a multimode fiber is inherently non‐unitary. It is demonstrated that this erroneous assumption can impede the performance of many commonly used MMF phase retrieval algorithms and demonstrate that the weighted Yang–Gu algorithm outperforms other phase retrieval algorithms in this scenario. Once accounted for, the non‐unitary property of the transmission matrix can be leveraged to generate intricate intensity and phase patterns at the output of the fiber, and shape specific output fields. This is experimentally demonstrated by generating Laguerre–Gaussian beams that carry orbital angular momentum, and by forming images in planes offset from the distal end of the fiber facet.
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Research context

OpenAlex topics: Random lasers and scattering media · Optical Coherence Tomography Applications · Optical Polarization and Ellipsometry

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Optofluidics Group, Cavendish Laboratory University of Cambridge Cambridge CB3 0HE UK

Centre of Molecular Materials for Photonics and Electronics, Electrical Engineering Department University of Cambridge Cambridge CB3 0FA UK

Centre of Light for Life, School of Biological Sciences University of Adelaide Adelaide 5005 Australia

Optics and Photonics Research Group University of Nottingham University Park Nottingham NG7 2RD UK

Lumen Lab, University of Nottingham University Park Nottingham NG7 2RD UK

Optical Manipulation Group, School of Physics & Astronomy University of St. Andrews St Andrews KY16 9SS United Kingdom

Funding

Engineering and Physical Sciences Research Council · Australian Research Council

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