High-brightness laser imaging with tunable speckle reduction enabled by electroactive micro-optic diffusers
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 utilize...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2018
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| Online Access: | https://hdl.handle.net/10356/87977 http://hdl.handle.net/10220/45585 |
| _version_ | 1826123210491428864 |
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| author | Farrokhi, Hamid Rohith, Thazhe Madam Boonruangkan, Jeeranan Han, Seunghwoi Kim, Hyunwoong Kim, Seung-Woo Kim, Young-Jin |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Farrokhi, Hamid Rohith, Thazhe Madam Boonruangkan, Jeeranan Han, Seunghwoi Kim, Hyunwoong Kim, Seung-Woo Kim, Young-Jin |
| author_sort | Farrokhi, Hamid |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T06:00:55Z |
| format | Journal Article |
| id | ntu-10356/87977 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:00:55Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/879772023-03-04T17:13:41Z High-brightness laser imaging with tunable speckle reduction enabled by electroactive micro-optic diffusers Farrokhi, Hamid Rohith, Thazhe Madam Boonruangkan, Jeeranan Han, Seunghwoi Kim, Hyunwoong Kim, Seung-Woo Kim, Young-Jin School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering Imaging Speckle 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. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2018-08-17T06:12:32Z 2019-12-06T16:53:22Z 2018-08-17T06:12:32Z 2019-12-06T16:53:22Z 2017 Journal Article 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-. 2045-2322 https://hdl.handle.net/10356/87977 http://hdl.handle.net/10220/45585 10.1038/s41598-017-15553-9 en Scientific Reports © 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 http://creativecommons.org/licenses/by/4.0/. 8 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Mechanical engineering Imaging Speckle Farrokhi, Hamid Rohith, Thazhe Madam Boonruangkan, Jeeranan Han, Seunghwoi Kim, Hyunwoong Kim, Seung-Woo Kim, Young-Jin High-brightness laser imaging with tunable speckle reduction enabled by electroactive micro-optic diffusers |
| title | High-brightness laser imaging with tunable speckle reduction enabled by electroactive micro-optic diffusers |
| title_full | High-brightness laser imaging with tunable speckle reduction enabled by electroactive micro-optic diffusers |
| title_fullStr | High-brightness laser imaging with tunable speckle reduction enabled by electroactive micro-optic diffusers |
| title_full_unstemmed | High-brightness laser imaging with tunable speckle reduction enabled by electroactive micro-optic diffusers |
| title_short | High-brightness laser imaging with tunable speckle reduction enabled by electroactive micro-optic diffusers |
| title_sort | high brightness laser imaging with tunable speckle reduction enabled by electroactive micro optic diffusers |
| topic | DRNTU::Engineering::Mechanical engineering Imaging Speckle |
| url | https://hdl.handle.net/10356/87977 http://hdl.handle.net/10220/45585 |
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