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dc.contributor.authorHalpaap, Donatus
dc.contributor.authorTiana Alsina, Jordi
dc.contributor.authorVilaseca Ricart, Meritxell
dc.contributor.authorMasoller Alonso, Cristina
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Òptica i Optometria
dc.date.accessioned2019-12-04T18:14:32Z
dc.date.available2019-12-04T18:14:32Z
dc.date.issued2019-09-30
dc.identifier.citationHalpaap, 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.issn1094-4087
dc.identifier.urihttp://hdl.handle.net/2117/173562
dc.description.abstractSpeckle 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.extent8 p.
dc.language.isoeng
dc.subjectÀrees temàtiques de la UPC::Física
dc.subject.lcshSemiconductor lasers
dc.subject.lcshImage processing
dc.titleExperimental characterization of the speckle pattern at the output of a multimode optical fiber
dc.typeArticle
dc.subject.lemacLàsers de semiconductors
dc.subject.lemacImatges -- Processament
dc.contributor.groupUniversitat Politècnica de Catalunya. DONLL - Dinàmica no Lineal, Òptica no Lineal i Làsers
dc.contributor.groupUniversitat Politècnica de Catalunya. GREO - Grup de Recerca en Enginyeria Òptica
dc.identifier.doi10.1364/OE.27.027737
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttps://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-20-27737
dc.rights.accessOpen Access
local.identifier.drac25844094
dc.description.versionPostprint (published version)
dc.relation.projectidinfo: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.projectidinfo: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.projectidinfo: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.projectidinfo:eu-repo/grantAgreement/EC/H2020/675512/EU/Advanced BiomEdical OPTICAL Imaging and Data Analysis/BE-OPTICAL
local.citation.authorHalpaap, D.; Tiana-Alsina, J.; Vilaseca, M.; Masoller, C.
local.citation.publicationNameOptics express
local.citation.volume27
local.citation.number20
local.citation.startingPage27737
local.citation.endingPage27744


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