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Hernández García, Carlos Holgado Lage, Warein Plaja Rustein, Luis Alonso Fernández, Benjamín Silva, Francisco Miranda, Miguel Crespo, Helder Sola Larrañaga, Iñigo Juan 2021-05-20T07:04:35Z 2021-05-20T07:04:35Z 2015-08 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 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. eng http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional Attosecond pulses Hollow core fibers Laser beam propagation Laser sources Phase matching Soft x rays Carrier-envelope-phase insensitivity in high-order harmonic generation driven by few-cycle laser pulses info:eu-repo/semantics/article