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Title: High-brightness laser imaging with tunable speckle reduction enabled by electroactive micro-optic diffusers
Authors: Farrokhi, Hamid
Rohith, Thazhe Madam
Boonruangkan, Jeeranan
Han, Seunghwoi
Kim, Hyunwoong
Kim, Seung-Woo
Kim, Young-Jin
Keywords: DRNTU::Engineering::Mechanical engineering
Issue Date: 2017
Source: Farrokhi, H., Rohith, T. M., Boonruangkan, J., Han, S., Kim, H., Kim, S.-W., et al. (2017). High-brightness laser imaging with tunable speckle reduction enabled by electroactive micro-optic diffusers. Scientific Reports, 7(1), 15318-.
Series/Report no.: Scientific Reports
Abstract: High coherence of lasers is desirable in high-speed, high-resolution, and wide-field imaging. However, it also causes unavoidable background speckle noise thus degrades the image quality in traditional microscopy and more significantly in interferometric quantitative phase imaging (QPI). QPI utilizes optical interference for high-precision measurement of the optical properties where the speckle can severely distort the information. To overcome this, we demonstrated a light source system having a wide tunability in the spatial coherence over 43% by controlling the illumination angle, scatterer’s size, and the rotational speed of an electroactive-polymer rotational micro-optic diffuser. Spatially random phase modulation was implemented for the lower speckle imaging with over a 50% speckle reduction without a significant degradation in the temporal coherence. Our coherence control technique will provide a unique solution for a low-speckle, full-field, and coherent imaging in optically scattering media in the fields of healthcare sciences, material sciences and high-precision engineering.
ISSN: 2045-2322
DOI: 10.1038/s41598-017-15553-9
Rights: © 2017 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Te images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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