2026-09-17T03:08:52Zhttps://gredos.usal.es/oai/request

oai:gredos.usal.es:10366/1595172026-01-19T09:37:17Zcom_10366_133237com_10366_4512com_10366_3823col_10366_133238

Vismarra, Federico Fernández Galán, Marina Mocci, Daniele Colaizzi, Lorenzo Segundo, Víctor Wilfried Boyero García, Roberto Serrano, Javier Conejero Jarque, Enrique Pini, Marta Mai, Lorenzo Wu, Yingxuan Wörner, Hans Jakob Appi, Elisa Arnold, Cord L. Reduzzi, Maurizio Lucchini, Matteo San Román Álvarez de Lara, Julio Nisoli, Mauro Hernández García, Carlos Borrego Varillas, Rocío High-harmonic generation Nonlinear optics Ultrafast lasers [EN]Isolated attosecond pulse (IAP) generation usually involves the use of short-medium gas cells operated at high pressures. In contrast, long-medium schemes at low pressures are commonly perceived as inherently unsuitable for IAP generation due to the nonlinear phenomena that challenge favourable phase-matching conditions. Here we provide clear experimental evidence on the generation of isolated extreme-ultraviolet attosecond pulses in a semi-infinite gas cell, demonstrating the use of extended-medium geometries for effective production of IAPs. To gain a deeper understanding we develop a simulation method for high-order harmonic generation (HHG), which combines nonlinear propagation with macroscopic HHG solving the 3D time-dependent Schrödinger equation at the single-atom level. Our simulations reveal that the nonlinear spatio-temporal reshaping of the driving field, observed in the experiment as a bright plasma channel, acts as a self-regulating mechanism boosting the phase-matching conditions for the generation of IAPs. 2024-09-11 2024-09-11 2024-08 info:eu-repo/semantics/article Vismarra, F., Fernández-Galán, M., Mocci, D., Colaizzi, L., Segundo, V. W., Boyero-García, R., Serrano, J., Conejero-Jarque, E., Pini, M., Mai, L., Wu, Y., Wörner, H. J., Appi, E., Arnold, C. L., Reduzzi, M., Lucchini, M., San Román, J., Nisoli, M., Hernández-García, C., & Borrego-Varillas, R. (2024). Isolated attosecond pulse generation in a semi-infinite gas cell driven by time-gated phase matching. Light: Science & Applications, 13(1), 197. https://doi.org/10.1038/s41377-024-01564-5 2047-7538 http://hdl.handle.net/10366/159517 10.1038/s41377-024-01564-5 2047-7538 eng https://doi.org/10.1038/s41377-024-01564-5 info:eu-repo/grantAgreement/EC/H2020/871161/EU info:eu-repo/grantAgreement/EC/H2020/951224/EU info:eu-repo/grantAgreement/EC/H2020/851201/EU info:eu-repo/grantAgreement/EC/H2020/848411/EU PID2022-142340NB-I00 info:eu-repo/semantics/openAccess Nature