86504 20200716101511.0 doi 10.1016/j.optcom.2019.01.005 sideral 110353 ART-2019-110353 eng (orcid)0000-0002-2523-8598 Jarabo, S. Universidad de Zaragoza Sensitivity enhancement by increasing the nonlinear crystal length in second-order autocorrelators for ultrashort laser pulses measurement 2019 Access copy available to the general public Unrestricted A theoretical model for interferometric autocorrelation with long nonlinear crystal (input depleted) has been developed and applied to the measurement of the duration of ultrashort pulses. The phase-matching condition is assumed throughout pulse spectrum. The interferometric autocorrelation trace of a mode-locked fibre laser (20 nJ energy, 100 kW peak power, centred at 1595 nm) has been measured by employing a fibre interferometer to avoid misalignment effects and a BBO nonlinear crystal as long as 2 mm, in order to generate higher second-harmonic power. BBO crystal was used because it can keep the phase-matching condition throughout a wide spectrum around 1600 nm. By fitting the experimental measurements and computing according to the theoretical model exposed, it has been demonstrated that the autocorrelator sensitivity is clearly enhanced by increasing the nonlinear crystal length. A temporal duration of 0.18 ps has been obtained by fitting theoretical and experimental values. info:eu-repo/grantAgreement/ES/MINECO/FIS2013-44174-P info:eu-repo/grantAgreement/ES/UZ/UZ-SANTANDER info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 2.125 2019 OPTICS 49 / 97 = 0.505 2019 Q3 T2 0.698 2019 Electrical and Electronic Engineering 2019 Q1 Physical and Theoretical Chemistry 2019 Q2 Electronic, Optical and Magnetic Materials 2019 Q2 Atomic and Molecular Physics, and Optics 2019 Q2 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Rodríguez-Martín, E. (orcid)0000-0003-0233-9350 Saldaña-Díaz, J.E. (orcid)0000-0002-6048-310X Salgado-Remacha, F.J. Universidad de Zaragoza 2002 385 Universidad de Zaragoza Dpto. Física Aplicada Área Física Aplicada 2002 647 Universidad de Zaragoza Dpto. Física Aplicada Área Óptica 437 (2019), 367-372 Opt. commun. Optics Communications 0030-4018 1068984 http://zaguan.unizar.es/record/86504/files/texto_completo.pdf Postprint 76209 http://zaguan.unizar.es/record/86504/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:86504 articulos driver 2020-07-16-09:19:12 ARTICLE