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oai:gredos.usal.es:10366/1460412025-04-30T20:35:56Zcom_10366_133237com_10366_4512com_10366_3823col_10366_133238

Carrier-envelope-phase insensitivity in high-order harmonic generation driven by few-cycle laser pulses Hernández García, Carlos Holgado Lage, Warein Plaja Rustein, Luis Alonso Fernández, Benjamín Silva, Francisco Miranda, Miguel Crespo, Helder Sola Larrañaga, Iñigo Juan Attosecond pulses Hollow core fibers Laser beam propagation Laser sources Phase matching Soft x rays We present evidence for self-stabilization of the relative spectral phase of high-order harmonic emission against intensity variations of the driving field. Our results demonstrate that, near the laser focus, phase matching of the harmonic field from a macroscopic target can compensate for the intensity dependence of the intrinsic phase of the harmonics emitted by a single radiator. As a consequence, we show experimentally and theoretically the insensitivity of the harmonic spectra produced at the laser focus against variations of the carrier-envelope phase (CEP) of a sub-two-cycle driving field. In addition, the associated attosecond pulse trains exhibit phase locking against CEP changes of the few-cycle driver. 2021-05-20T07:04:35Z 2021-05-20T07:04:35Z 2015-08 info:eu-repo/semantics/article C. Hernández-García, W. Holgado, L. Plaja, B. Alonso, F. Silva, M. Miranda, H. Crespo, and I. J. Sola, "Carrier-envelope-phase insensitivity in high-order harmonic generation driven by few-cycle laser pulses," Opt. Express 23, 21497-21508 (2015) http://hdl.handle.net/10366/146041 10.1364/OE.23.021497 1094-4087 eng FIS2013-44174-P SA116U13 http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional