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31 May 2023 Measuring the transmission matrix of a multimode fiber: on-axis vs off-axis holography
Aleksandra Ivanina, Benjamin Lochocki, Lyubov V. Amitonova
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Proceedings Volume 12574, Holography: Advances and Modern Trends VIII; 125740T (2023) https://doi.org/10.1117/12.2666546
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic
Abstract
The transmission matrix (TM) measurement is a powerful and well-known tool for characterizing scattering media such as multimode fibers (MMF). Access to the phase of the optical field based on the results of intensity measurements is a long-standing problem known as the phase retrieval problem. To obtain the complex optical field and therefore phase information, it is necessary to use interferences with a known wavefront. In this work, we compare two interferometric methods: on-axis holography with a speckle reference beam propagating through the same optical path and off-axis holography with a plane wave reference beam propagating via an additional arm. These methods, combined with a DMD, provide a fast and accurate way to measure the TM. We present results and a detailed comparison of the two methods of TM measurements of the same system.
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Aleksandra Ivanina, Benjamin Lochocki, and Lyubov V. Amitonova "Measuring the transmission matrix of a multimode fiber: on-axis vs off-axis holography", Proc. SPIE 12574, Holography: Advances and Modern Trends VIII, 125740T (31 May 2023); https://doi.org/10.1117/12.2666546
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KEYWORDS
Holography
Multimode fibers
Wavefronts
Beam propagation method
Digital micromirror devices
Wave propagation interference
Scattering media
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