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oai:gredos.usal.es:10366/1460462025-04-30T20:35:55Zcom_10366_133237com_10366_4512com_10366_3823col_10366_133238

Holgado Lage, Warein Alonso Fernández, Benjamín San Román Álvarez de Lara, Julio Sola Larrañaga, Iñigo Juan 2021-05-20T07:05:34Z 2021-05-20T07:05:34Z 2014-05 W. Holgado, B. Alonso, J. San Román, and I. J. Sola, "Temporal and spectral structure of the infrared pulse during the high order harmonic generation," Opt. Express 22, 10191-10201 (2014) http://hdl.handle.net/10366/146046 10.1364/OE.22.010191 1094-4087 We present, for the first time, the complete pulse characterization of the infrared pulse after generating harmonics. A systematic study of the high harmonic generation process, and the generating infrared pulse characterization, has been done by changing the focus-gas-jet relative position. We have concluded, supported by nonlinear propagation simulations, that there is a correlation between the spectral and temporal nonlinear evolution of the infrared generating field and the structures shown in the harmonic signal. We have identified two different pressure regimes: the low pressure regime, characterized by the effects produced by the plasma generated by the infrared pulse, and the high pressure regime where the plasma and the Kerr effect generated by the infrared field are both present. These observations highlight the important role played by the nonlinear propagation of the generating field in the high harmonic generation context. Spanish Ministerio de Ciencia e Innovación (MICINN) through the Consolider Program SAUUL ( CSD2007-00013) and Research Project FIS2009-09522, from the Junta de Castilla y León (Project No. SA116U13) and from Centro de Láseres Pulsados. B. A. acknowledges Fundaçao para a Ciencia e a Tecnologia (FCT) through grant No. SFRH/BPD/88424/2012. W. H. and I. J. S. also acknowledge support from the Spanish Ministerio de Ciencia e Innovación through the Formación de Personal Investigador and Ramón y Cajal grant programs respectively. application/pdf eng Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess High harmonic generation Infrared lasers Laser beams Nonlinear effects Phase matching Spectral properties Temporal and spectral structure of the infrared pulse during the high order harmonic generation info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion CSD2007-00013 FIS2009-09522 SA116U13 Optics Express 22 9 10191