Dr. Ruiduo Wang Profile

Dr. Ruiduo Wang

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Publications (3)

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Proceedings Article | 15 February 2022 Paper

Imaging through scattering medium based on lensless Fourier transform digital holography

Hui Zhang, Ruiduo Wang, Zaikun Zhang, Zhengquan He

Proceedings Volume 12166, 121665X (2022) https://doi.org/10.1117/12.2617699

KEYWORDS: 3D image reconstruction, Glasses, Scattering, Fourier transforms, Speckle, Digital holography, Charge-coupled devices, Scattering media, Light scattering, Holography

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Recovering information of an object hidden behind turbid media has a vast range of applications. People have been trying many ways to achieve this goal. In this paper, we use lensless Fourier transform digital holography and statistical average to retrieve object information from speckle field. The relationship between parameters of ground glass and peak signal-tonoise ratio of reconstructed image is explored by establishing a rotating ground glass interferometric imaging system. The light beam emitted from the laser is divided into two beams by the beam splitter. One beam passes through the rotating ground glass after being reflected by the object (i.e. object light), and the other beam passes through the reflector and convex lens as a reference light, and then interferes with the object light. Finally the interference speckle pattern is captured by a CCD camera. Experiment results show that there is an optimal solution between the rotation speed of ground glass and the peak signal-to-noise ratio of the reconstructed image.This method has the advantages of compact system construction , easy implementation and fast reconstruction, since it does not require phase correction, complex image processing, scanning object or wavefront shaping.

Proceedings Article | 2 December 2020 Paper

High-speed focusing and scanning light through multimode fiber

Yi Geng, Zaikun Zhang, Zhengquan He, Hui Chen, Ruiduo Wang, Depeng Kong, Haitao Guo

Proceedings Volume 11717, 1171715 (2020) https://doi.org/10.1117/12.2586318

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The image distortions caused by the inherent mode dispersion and coupling of the multimode fiber (MMF) lead its output light field to be scattered and prevent it from applicating in endoscopy. Although various wavefront shaping methods have been proposed to overcome these image distortions and form the focused spots through the MMF, they a re usually time-consuming due to the multiple iterations and tedious calculation. In this paper, we present a binary amplitude-only modulation parallel coordinate algorithm for focusing and scanning light through a multimode fiber (MMF) based on the digital micro-mirror device (DMD) in a reference-free multimode fiber imaging system. In principle, our algorithm is capable of efficiently calculating the masks to be added to DMD for yielding a series of tightly focused spots; and for the same number of modulation sub-regions, our method is more than M (the number of focused spots) times faster than the amplitude iterative optimization algorithm. In the experiment, efficient light focusing and scanning at the distal end of the MMF without the iteration process are demonstrated. Furthermore, we demonstrate that the proposed method can also be extended to focus and scan light at multiple planes along the axial direction by just modifying the input wavefront accordingly. We predict the high-speed focusing method through the MMF might have the potential application for fast spot-scanning imaging.

Proceedings Article | 2 December 2020 Paper

Single multimode fiber focused spot scanning based on a liquid crystal spatial light modulator

Zaikun Zhang, Yi Geng, Hui Chen, Ruiduo Wang, Zhengquan He

Proceedings Volume 11717, 1171714 (2020) https://doi.org/10.1117/12.2586312

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At present, there are some problems in the digital scanning imaging methods of multimode optical fiber, such as poor quality of focused spot, large amount of calculation and long time in the forming process of focused spot. In order to solve the above problems, a parallel phase compensation method based on liquid crystal spatial light modulator (LCSLM) is proposed to achieve fast point-focused scanning of multimode fiber (MMF). The parallel algorithm, which includes the two processes of collecting online specklegrams and calculating offline phase masks, calculates the compensation phase masks so that the phase masks can be loaded on SLM in turn to generate a series of focused spots at different predefined positions, which greatly saves time. Experiments demonstrate that this method doesn’t need many iterations, and the phase compensation mask used for focusing spot at a predefined position on the MMF output facet can be obtained by using a two-step phase-shifting technique, and a series of phase compensation masks can be quickly obtained by using the parallel method, so as to form focused spots at different predefined positions. Experimentally, we obtained 100 focused spots, the average focused efficiency was 30.12%, the average focused diameter was 2.3382μμm, and the quality of the focused spot was improved compared with previous reports.

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