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Speckle reduction in double-pass retinal images

The double pass (DP) technique quantifies the optical quality of the eye by measuring its point spread function. The low reflectivity of the retina requires the use of a high-brightness, point-like illumination source, and thus, DP systems use laser diodes (LDs). However, LDs light produces speckle,...

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Autores principales: Halpaap, Donatus, García-Guerra, Carlos E., Vilaseca, Meritxell, Masoller, Cristina
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6418212/
https://www.ncbi.nlm.nih.gov/pubmed/30872739
http://dx.doi.org/10.1038/s41598-019-41168-3
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author Halpaap, Donatus
García-Guerra, Carlos E.
Vilaseca, Meritxell
Masoller, Cristina
author_facet Halpaap, Donatus
García-Guerra, Carlos E.
Vilaseca, Meritxell
Masoller, Cristina
author_sort Halpaap, Donatus
collection PubMed
description The double pass (DP) technique quantifies the optical quality of the eye by measuring its point spread function. The low reflectivity of the retina requires the use of a high-brightness, point-like illumination source, and thus, DP systems use laser diodes (LDs). However, LDs light produces speckle, and a low-cost solution to reduce speckle is to include a vibrating mirror in the beam path. With the goal of finding an all-optical solution, here we perform a comparative study of the amount of speckle produced by three semiconductor light sources: an LD, a light emitting diode (LED), and a superluminescent diode (SLED). We also compare the results with the speckle reduction that is obtained with a vibrating mirror. We find that the SLED is a good alternative to LD illumination, as the amount of speckle in the image is almost as low as that obtained with an LD and a vibrating mirror in the beam path.
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spelling pubmed-64182122019-03-18 Speckle reduction in double-pass retinal images Halpaap, Donatus García-Guerra, Carlos E. Vilaseca, Meritxell Masoller, Cristina Sci Rep Article The double pass (DP) technique quantifies the optical quality of the eye by measuring its point spread function. The low reflectivity of the retina requires the use of a high-brightness, point-like illumination source, and thus, DP systems use laser diodes (LDs). However, LDs light produces speckle, and a low-cost solution to reduce speckle is to include a vibrating mirror in the beam path. With the goal of finding an all-optical solution, here we perform a comparative study of the amount of speckle produced by three semiconductor light sources: an LD, a light emitting diode (LED), and a superluminescent diode (SLED). We also compare the results with the speckle reduction that is obtained with a vibrating mirror. We find that the SLED is a good alternative to LD illumination, as the amount of speckle in the image is almost as low as that obtained with an LD and a vibrating mirror in the beam path. Nature Publishing Group UK 2019-03-14 /pmc/articles/PMC6418212/ /pubmed/30872739 http://dx.doi.org/10.1038/s41598-019-41168-3 Text en © The Author(s) 2019 Open Access 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. The 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/.
spellingShingle Article
Halpaap, Donatus
García-Guerra, Carlos E.
Vilaseca, Meritxell
Masoller, Cristina
Speckle reduction in double-pass retinal images
title Speckle reduction in double-pass retinal images
title_full Speckle reduction in double-pass retinal images
title_fullStr Speckle reduction in double-pass retinal images
title_full_unstemmed Speckle reduction in double-pass retinal images
title_short Speckle reduction in double-pass retinal images
title_sort speckle reduction in double-pass retinal images
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6418212/
https://www.ncbi.nlm.nih.gov/pubmed/30872739
http://dx.doi.org/10.1038/s41598-019-41168-3
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