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Experimental characterization of the speckle pattern at the output of a multimode optical fiber
dc.contributor.author | Halpaap, Donatus |
dc.contributor.author | Tiana Alsina, Jordi |
dc.contributor.author | Vilaseca Ricart, Meritxell |
dc.contributor.author | Masoller Alonso, Cristina |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Física |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament d'Òptica i Optometria |
dc.date.accessioned | 2019-12-04T18:14:32Z |
dc.date.available | 2019-12-04T18:14:32Z |
dc.date.issued | 2019-09-30 |
dc.identifier.citation | Halpaap, D. [et al.]. Experimental characterization of the speckle pattern at the output of a multimode optical fiber. "Optics express", 30 Setembre 2019, vol. 27, núm. 20, p. 27737-27744. |
dc.identifier.issn | 1094-4087 |
dc.identifier.uri | http://hdl.handle.net/2117/173562 |
dc.description.abstract | Speckle patterns produced by coherent waves interfering with each other are undesirable in many imaging applications (for example, in laser projection systems) but on the other hand, they contain useful information that can be exploited (for example, for blood flow analysis or reconstruction of the object that generates the speckle). It is therefore important to understand how speckle can be enhanced or reduced by tailoring the coherence of laser light. Using a conventional semiconductor laser and a multimode optical fiber we study experimentally how the speckle pattern depends on the laser pump current and on the image acquisition settings. By varying the pump current from below to above the lasing threshold, and simultaneously tuning the image exposure time to compensate for the change in brightness, we find conditions that allow for recorded images with similar average intensity, but with speckle contrast (the standard deviation of the intensity over the average intensity) as low as 0.16, or as high as 0.99. |
dc.format.extent | 8 p. |
dc.language.iso | eng |
dc.subject | Àrees temàtiques de la UPC::Física |
dc.subject.lcsh | Semiconductor lasers |
dc.subject.lcsh | Image processing |
dc.title | Experimental characterization of the speckle pattern at the output of a multimode optical fiber |
dc.type | Article |
dc.subject.lemac | Làsers de semiconductors |
dc.subject.lemac | Imatges -- Processament |
dc.contributor.group | Universitat Politècnica de Catalunya. DONLL - Dinàmica no Lineal, Òptica no Lineal i Làsers |
dc.contributor.group | Universitat Politècnica de Catalunya. GREO - Grup de Recerca en Enginyeria Òptica |
dc.identifier.doi | 10.1364/OE.27.027737 |
dc.description.peerreviewed | Peer Reviewed |
dc.relation.publisherversion | https://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-20-27737 |
dc.rights.access | Open Access |
local.identifier.drac | 25844094 |
dc.description.version | Postprint (published version) |
dc.relation.projectid | info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/DPI2017-89414-R/ES/INGENIERIA FOTONICA PARA EL DIAGNOSTICO, SEGUIMIENTO Y TRATAMIENTO DE ENFERMEDADES OCULARES Y SANGUINEAS/ |
dc.relation.projectid | info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PGC2018-099443-B-I00/ES/SISTEMAS DINAMICOS COMPLEJOS Y HERRAMIENTAS AVANZADAS DE ANALISIS DE DATOS/ |
dc.relation.projectid | info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/DPI2017-89414-R/ES/INGENIERIA FOTONICA PARA EL DIAGNOSTICO, SEGUIMIENTO Y TRATAMIENTO DE ENFERMEDADES OCULARES Y SANGUINEAS/ |
dc.relation.projectid | info:eu-repo/grantAgreement/EC/H2020/675512/EU/Advanced BiomEdical OPTICAL Imaging and Data Analysis/BE-OPTICAL |
local.citation.author | Halpaap, D.; Tiana-Alsina, J.; Vilaseca, M.; Masoller, C. |
local.citation.publicationName | Optics express |
local.citation.volume | 27 |
local.citation.number | 20 |
local.citation.startingPage | 27737 |
local.citation.endingPage | 27744 |
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