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dc.contributor.authorYáñez Alvarado, Carlos René
dc.contributor.authorRoyo Royo, Santiago
dc.contributor.otherUniversitat Politècnica de Catalunya. Doctorat en Enginyeria Òptica
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Òptica i Optometria
dc.identifier.citationYañez, C.; Royo, S. Improvement of the signal-to-noise ratio in a low power self-mixing interferometer using a coupled interferometric effect. "Optics express", 7 Desembre 2020, vol. 28, núm. 25, p. 37708-37720.
dc.description.abstractWe present experimental results of a low-emission self-mixing interferometer that uses a coupled interferometric effect to improve the signal produced by a vibrating target. This method is intended to be useful in applications where the target is prone to be damaged by high-intensity laser sources. The beam of a Fabry-Perot laser diode is split and ~21% of the original emission is used to measure the harmonic micro-displacements of the target using the self-mixing effect. A portion of the residual beam, which also carries the interferometric information related to the target displacement, is reinjected back into the laser cavity by means of a fixed reflector, causing a second interferometric phenomenon that improves the signal-to-noise ratio of the measurement by up to ~13 dB. A theoretical description of the phenomena is also proposed. Further, we apply this technique to the two most common self-mixing sensing schemes: internal photodiode and junction voltage. The reported results show good agreement with theory and prove the capability of the method to enhance the SNR in SMI schemes.
dc.description.sponsorshipConsejo Nacional de Ciencia y Tecnología (472102); Ministerio de Economía y Competitividad (FIS2017-89850R).
dc.format.extent13 p.
dc.subjectÀrees temàtiques de la UPC::Ciències de la visió
dc.titleImprovement of the signal-to-noise ratio in a low power self-mixing interferometer using a coupled interferometric effect
dc.contributor.groupUniversitat Politècnica de Catalunya. GREO - Grup de Recerca en Enginyeria Òptica
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
dc.relation.projectidinfo:eu-repo/grantAgreement/MINECO/2PE/ FIS2017-89850-R
local.citation.authorYañez, C.; Royo, S.
local.citation.publicationNameOptics express

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