000118802 001__ 118802 000118802 005__ 20240319081004.0 000118802 0247_ $$2doi$$a10.1016/j.ijleo.2022.169722 000118802 0248_ $$2sideral$$a129780 000118802 037__ $$aART-2022-129780 000118802 041__ $$aeng 000118802 100__ $$0(orcid)0000-0003-3178-5253$$aTorcal-Milla, F.$$uUniversidad de Zaragoza 000118802 245__ $$aMach-Zehnder-based measurement of light emitting diodes temporal coherence 000118802 260__ $$c2022 000118802 5060_ $$aAccess copy available to the general public$$fUnrestricted 000118802 5203_ $$aObjectives: The main objective of this work is to validate a Mach-Zehnder based interferometric method to measure the temporal coherence length of broadband finite size light sources such as Light Emitting Diodes (LEDs), and give a qualitative value of the temporal coherence length of white LEDs, for which nor their spectral width neither their emission peak wavelength are clearly defined. Motivation: Low-coherence light sources such as LEDs have opened many possibilities in applications in which using lasers introduces coherent noise (speckle) that hinders the performance of interferometric measurement techniques. The coherence length is an important characteristic of light sources for scientific applications related to diffraction, holography, tomography, or interferometry. The spatial coherence of a source depends on the distance from the source to the observation plane and its size, while the temporal coherence is related to the emission spectral width and the emission peak wavelength. Therefore, the temporal coherence is a characteristic of each source. Methodology and results: In this work, we use a Mach-Zehnder interferometer for the first time to measure the coherence degree and the temporal coherence length of quasi-monochromatic LEDs. We validate the technique by comparing the results to those obtained directly from the spectrum. Then, we use the tested interferometric method to measure the temporal coherence length of a white LED, for which neither the width of the spectrum nor the emission peak wavelength, are clearly defined. In this case, the Wiener-Khinchin theorem is used to validate the interferometric technique. A very interesting property of the method is that the temporal coherence length is obtained from a single measurement, without needing to perform a scanning. This method can be used also for other non-coherent sources such as halogen lamps, pulsed lasers, and so on. The obtained results will improve the characterization of light sources and the applications dealing with physical optics and electromagnetic interference. © 2022 The Authors 000118802 536__ $$9info:eu-repo/grantAgreement/ES/DGA-FEDER/E44-20R$$9info:eu-repo/grantAgreement/ES/MICINN/PID2020-113303GB-C22$$9info:eu-repo/grantAgreement/ES/UZ/JIUZ-2020-CIE-06 000118802 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/ 000118802 590__ $$a3.1$$b2022 000118802 592__ $$a0.539$$b2022 000118802 591__ $$aOPTICS$$b41 / 99 = 0.414$$c2022$$dQ2$$eT2 000118802 593__ $$aAtomic and Molecular Physics, and Optics$$c2022$$dQ2 000118802 593__ $$aElectronic, Optical and Magnetic Materials$$c2022$$dQ2 000118802 593__ $$aElectrical and Electronic Engineering$$c2022$$dQ2 000118802 594__ $$a5.7$$b2022 000118802 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000118802 700__ $$0(orcid)0000-0001-7930-272X$$aLobera Salazar, J.$$uUniversidad de Zaragoza 000118802 700__ $$0(orcid)0000-0002-8451-0942$$aLopez, A. M.$$uUniversidad de Zaragoza 000118802 700__ $$0(orcid)0000-0003-1955-6714$$aPalero, V.$$uUniversidad de Zaragoza 000118802 700__ $$0(orcid)0000-0003-2639-3562$$aAndres Gimeno, N.$$uUniversidad de Zaragoza 000118802 700__ $$0(orcid)0000-0001-5935-897X$$aArroyo de Grandes, M. P.$$uUniversidad de Zaragoza 000118802 7102_ $$12002$$2385$$aUniversidad de Zaragoza$$bDpto. Física Aplicada$$cÁrea Física Aplicada 000118802 7102_ $$15008$$2800$$aUniversidad de Zaragoza$$bDpto. Ingeniería Electrón.Com.$$cÁrea Teoría Señal y Comunicac. 000118802 773__ $$g267 (2022), 169722 [11 pp.]$$pOptik$$tOptik$$x0030-4026 000118802 8564_ $$s3519458$$uhttps://zaguan.unizar.es/record/118802/files/texto_completo.pdf$$yVersión publicada 000118802 8564_ $$s1771028$$uhttps://zaguan.unizar.es/record/118802/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000118802 909CO $$ooai:zaguan.unizar.es:118802$$particulos$$pdriver 000118802 951__ $$a2024-03-18-14:24:18 000118802 980__ $$aARTICLE