130191 20241125101139.0 doi 10.1364/OL.491481 sideral 134169 ART-2023-134169 eng Torcal-Milla, F. J. Universidad de Zaragoza (orcid)0000-0003-3178-5253 Modified Mach–Zehnder interferometer for spatial coherence measurement 2023 Access copy available to the general public Unrestricted Spatial coherence of light sources is usually obtained by using the classical Young’s interferometer. Although the original experiment was improved upon in successive works, some drawbacks still remain. For example, several pairs of points must be used to obtain the complex coherence degree (normalized first-order correlation function) of the source. In this work, a modified Mach–Zehnder interferometer which includes a pair of lenses and is able to measure the spatial coherence degree is presented. With this modified Mach–Zehnder interferometer, it is possible to measure the full 4D spatial coherence function by displacing the incoming beam laterally. To test it, we have measured only a 2D projection (zero shear) of the 4D spatial coherence, which is enough to characterize some types of sources. The setup has no movable parts, making it robust and portable. To test it, the two-dimensional spatial coherence of a high-speed laser with two cavities was measured for different pulse energy values. We observe from the experimental measurements that the complex degree of coherence changes with the selected output energy. Both laser cavities seem to have similar complex coherence degrees for the maximum energy, although it is not symmetrical. Thus, this analysis will allow us to determine the best configuration of the double-cavity laser for interferometric applications. Furthermore, the proposed approach can be applied to any other light sources. info:eu-repo/grantAgreement/ES/DGA-FEDER/E44-20R info:eu-repo/grantAgreement/ES/MICINN/PID2020-113303GB-C22 info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 3.1 2023 OPTICS 37 / 119 = 0.311 2023 Q2 T1 1.04 2023 Atomic and Molecular Physics, and Optics 2023 Q1 6.6 2023 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Lobera, J. Universidad de Zaragoza (orcid)0000-0001-7930-272X Roche, E. M. (orcid)0000-0003-1183-7052 Lopez, A. M. Universidad de Zaragoza (orcid)0000-0002-8451-0942 Palero, V. Universidad de Zaragoza (orcid)0000-0003-1955-6714 Andres, N. Universidad de Zaragoza (orcid)0000-0003-2639-3562 Arroyo, M. P. Universidad de Zaragoza (orcid)0000-0001-5935-897X 2002 385 Universidad de Zaragoza Dpto. Física Aplicada Área Física Aplicada 5008 800 Universidad de Zaragoza Dpto. Ingeniería Electrón.Com. Área Teoría Señal y Comunicac. 48, 12 (2023), 3127-3130 Opt. lett. Optics Letters 0146-9592 1285480 http://zaguan.unizar.es/record/130191/files/texto_completo.pdf Postprint info:eu-repo/date/embargoEnd/2024-06-30 3032200 http://zaguan.unizar.es/record/130191/files/texto_completo.jpg?subformat=icon icon Postprint info:eu-repo/date/embargoEnd/2024-06-30 oai:zaguan.unizar.es:130191 articulos driver 2024-11-22-12:02:02 ARTICLE